Note: there are more differences between the clutch packs. I have spent months of my time finding the information as it is very poorly documented (local honda dealer also didnt know the difference)
Plates:
Friction plates for 98-99 have an extra (larger i.d. plate) that stands out from the rest
Do note that the plate mentioned above is the only item differing in partnumber. the rest of the friction and steel are identical, just the quantity is different.
Judder spring + washer at the end of the clutchpack (after you pull all the plates out)
Springs (the 00-01 has heavier clutch springs)
grabby/unpredictable clutch can have some causes, I would go in this order to do the easily accessible stuff first:
inspection + rebuild Slave cylinder: mine looked horrrible when i pulled it, replaced the piston, seals, and fluids
Inspection of clutchpack: grabbyness can be caused by burrs on the inner or outer clutch basket, these can be lightly filed smooth or replaced, depending on what you are comfortable with