ok, i've only done this once so im not a total guru on the subject, but i swapped my sister's 94 LS seats into my stripped GSR and the back seat had some issues... ok i think what it was that the 94 had a metal piece that stuck into a hole somewhere while the 98 just had a bolt there. so im not sure what the 98 seats were supposed to have. i just remeber we gheto-rigged and it worked fine, we bent the piece up and put the bolt through it. its kind of a pain working a rachet under a seat though. not sure how well that will work going in the oppisite direction (2000 to 94). and yes the panels should be leather too. im drawing a blank and any of the other connections i think they lined up ok, but not perfectly. don't know if the leather interior has any differences of it own, i would imagine it is the same though.