a 4 cyl 2000 is essentially a reworked 601
you can swap in an 01 tranny of the same type with probably no mods or other parts swapping. ie.. 4spd in/out.
if it's a 5spd inthe 2000, use a dual clutch model, as that is what it should have.
on an older tranny, you may have spline and brake differences... and or may be needing the flywheel to match t he clutch..e tc. ( pinion tube ).. maybee some cut n paste there as well.