Transmission

What's the difference in the transmissions for the yrs 00-02
from either the 98-99 and or the 03-04. I know a
replacement engine is the same for 96-03 or something like
that, so I'd assume the transmissions would be relatively
the same as well. I have a 2000 passport, registration
shows it as a 99 for the yr, but a 00 model.  Having a hard
time finding an 00-02 auto tranny 4x4, but the 98-99 and
03-04 , I see plenty of and for about half the price. Is it
possible to make a 99 work with my vehicle, and if so what
changes would be necessary to do so