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Regarding the information about the discrepancies between CPHC and HURDAT, including only cyclones that achieved at least TS status, these are some I could dig up:

Pre-1966

Typhoon June of 1958, that briefly crossed the dateline from Western Pacific, isn't included on HURDAT;
Many unnamed tropical cyclones from 1961 to 1964 weren't included on HURDAT, but these ones have incomplete data.

1966

HURDAT data on CPAC part of Hurricane Blanca is incomplete. CPHC has a higher peak and more intensity fluctuations;
Hurricane Connie had some 55-knot and 65-knot datas per CPHC (JHWC). HURDAT jumps directly from 45 knots to 75 knots and vice-versa, not showing those 55 knots and 65 knots in the middle. Also, per CPHC Connie peaked as a Category 2 hurricane, unlike per HURDAT that shows a 75-knot peak;
Tropical Storm Gretchen was mostly a depression while in CPAC, but HURDAT shows it as a storm in all its duration on CPAC;
Tropical Depression Twenty-Two is not shown on HURDAT.

1967

HURDAT data on CPAC part of Tropical Storm Denise is incomplete. CPHC has a higher peak and more intensity fluctuations;
Hurricane Sarah's peak was 95 knots per CPHC, but per HURDAT Sarah peak was 65 knots;
HURDAT data on CPAC part of Tropical Storm Ramona is incomplete. CPHC has a higher peak and more intensity fluctuations.

1968

Tropical Storm Estelle crossed 140°W, but HURDAT shows it until 139.6W;
Tropical Storm Virginia, that crossed the dateline from Western Pacific, isn't included on HURDAT.

1970

HURDAT data on CPAC part of Tropical Storm Maggie is incomplete. CPHC has more intensity fluctuations.

1971

Hurricane Hilary almost crossed back to EPAC per CPHC, but per HURDAT it never went eastward.

1972

There are many discrepancies between CPHC and HURDAT about Hurricane Celeste. Although they both agree about its peak intensity, they disagree on how much time Celeste mantained the peak winds and the rates of intensification and weakening. And for CPHC, Celeste had a secondary peak as a major hurricane that HURDAT doesn't show;
Hurricane Diana in CPAC was weaker for CPHC (55 knots) than HURDAT shows (60 knots) for many advisories;
Typhoon Olga isn't included on HURDAT, but for CPHC it was a tropical depression while crossing to WPAC;
Typhoon Ruby peaked as a category 1 hurricane while being in CPAC for CPHC, but for HURDAT it was barely a tropical storm.

1973

There are many discrepancies between CPHC and HURDAT about Hurricane Doreen. For HURDAT, Doreen crossed into CPAC as a tropical storm and peaked there as a category 3 major hurricane, but for CPAC it crossed 140°W as a hurricane, but never attained major status while in CPAC. And for CPHC, Doreen's intensity was more steady than in HURDAT, whose Doreen's status fluctuated greatly.

1974

Many points assigned by CPHC on Hurricane Ione were omitted by HURDAT. For CPHC, it was a category 2 hurricane for more than a day before becoming a major, and for HURDAT it became a major while entering CPAC. And for HURDAT Ione dissipated one day before stated by CPHC;
Tropical Storm Olive formed earlier for CPHC than HURDAT, but it was weaker for the former than for the latter.

1975

According to CPHC, the 1975 Pacific Northwest hurricane became extratropical before crossing into EPAC, but for HURDAT it was still tropical after crossing 140°W.

1976

According to CPHC, Tropical Storm Gwen reformed on CPHC days after it's first degeneration, but for HURDAT it never happened;
Hurricane Kate peaked as a category 2 hurricane for CPHC, but for HURDAT it peaked only as a high-end category 1.

1978

Hurricane John lasted a day longer for CPHC than for HURDAT;
Hurricane Kristy was 5-knot weaker for CPHC than for HURDAT in almost all points;
Tropical Storm Lane was 5-knot stronger for CPHC than for HURDAT in almost all points;
Hurricane Miriam beacme a hurricane for HURDAT, but for CPHC it never deepened beyond TS status;
Hurricane Susan lasted longer and stronger as a major for CPHC than for HURDAT.

1980

Per CPHC, Tropical Storm Carmen formed on CPAC (although it was monitored by JTWC), briefly became a storm before crossing into WPAC and later crossed back into CPAC as a tropical storm, but Carmen isn't even included in HURDAT database.

1982

Hurricane Miriam was a hurricane just after crossing CPAC, but for CPHC it never deepened beyond TS status.
Tropical Storm Hana peaked 5-knot weaker for CPHC than for HURDAT.

1983

Hurricane Raymond peaked 10-knot weaker and lasted less for CPHC than for HURDAT.

1984

Tropical Storm Kenna dissipated a day earlier for CPHC than for HURDAT.

1985

Per CPHC, Typhoon Skip formed on CPAC (although it was monitored by JTWC), briefly became a storm before crossing into WPAC and later crossed back into CPAC as a tropical storm, but Skip isn't even included in HURDAT database;
Hurricane Rick weakened faster from peak for CPHC than for HURDAT;
Hurricane Nele recurved northeastward and had a secondary hurricane peak intensity per CPHC, while for HURDAT it mantained a northward movement and never went below hurricane status until dissipation.

1986

Tropical Storm Georgette attained TS status while in CPAC for CPHC, but for HURDAT it never became more than a depression while in CPAC.

1987

Typhoon Peke attained a weaker category 2 peak on CPAC for CPHC, and it weakened much earlier than for HURDAT.

1988

Hurricane Uleki peaked 5-knot weaker for CPHC than for HURDAT, but for more time.

1989

Tropical Storm Winona was considered a full tropical storm for six days after reananalysis while in CPAC, but HURDAT doesn't even included it;
According to HURDAT, Tropical Storm Erick briefly crossed 140°W before dissipating, but CPHC doesn't considered that it crossed while being tropical.

1990

Tropical Storm Aka had much less intensity fluctuations per CPHC than per HURDAT;
Hurricane Polo entered into CPAC 10-knot stronger for CPHC than for HURDAT.

1991

According to CPHC, Hurricane Enrique mantained tropical cyclone status all the way from exiting EPAC until entering WPAC, including a reestrenghening to TS status north of Hawaii, but for HURDAT Enrique dissipated shortly after crossing into CPAC.

1992

Hurricane Georgette dissipated almost 2 days later for CPHC than for HURDAT.
According to HURDAT, Tropical Storm Madeline briefly crossed 140°W before dissipating, but CPHC doesn't considered that it crossed while being tropical;
Hurricane Roslyn mantained TS status and lasted 5 more days in CPAC for CPHC than for HURDAT.

1994

Hurricane Emilia mantained category 5 intensity for 18 hours per CPHC, but for HURDAT it only maintained that intensity for 6 hours;
Hurricane Gilma mantained category 5 intensity for 12 hours then weakened steadly per CPHC, but for HURDAT maintained that intensity for 18 hours until it had a abrupt weakening.

1997

According to HURDAT, Typhoon Oliwa formed 3 days earlier than according to CPHC, but it was 10 knots weaker while in CPAC for the earlier than for the latter;
According to HURDAT, Typhoon Paka formed 4 days earlier than according to CPHC.

1999

Hurricane Dora weakened to TS status prior crossing to WPAC for CPHC, but for HURDAT it mantained hurricane status all the way in the CPAC.

2000

Tropical Storm Wene peaked stronger for CPHC than for HURDAT.

2001

According to HURDAT, Tropical Storm Barbara lasted 3 days more than according to CPHC.
For CPHC, Tropical Depression Two-C never strenghened beyond a 30-knot system, but per HURDAT it briefly became a tropical storm.

2002

According to HURDAT, Typhoon Ele formed 2 days earlier than according to CPHC;
According to HURDAT, Hurricane Huko formed a day earlier than according to CPHC.

2003

According to HURDAT, the remnants of Tropical Storm Felicia crossed 140°W before dissipating, but CPHC didn't back it up.

2006

Hurricane Ioke peaked 20-mbar higher for CPHC than for HURDAT;

Sources

There are many more, some minor differences I didn't cited and many CPAC depressions weren't included in HURDAT.

Some sources: