well i can Tell you this about 97 Itr..
#1 wiring main harness and srs both are diffrent.
#2 Rear body wiring harness is diffrent.
#3 97 itr uses a cable trunk popper.. 98+ itr uses power release.
#4 all the fuses are changed from 94-97 basic fuses (AGC) and all 98+ use all mini fuses...
#5 97 no rear wiper..
#6 97 didnt have the the cooler heater controlls like 98+ with the newer styleing readout
I know this Because the last couple of days ive been working on my 97 R putting in 99 gsr wiring ...