96-98 were one style, 99-00 were 'cleaned up' a little.

different front bumpers/headlights/hood/grill/fenders, different trunk lid, rear bumper, and tail lights.

they changed up the interiors on 99-00's, primarly the hvac/radio consol.

some different colors were available on different years.

thats pretty much all I can think of. but its just about all cosmetics.