Im doing just this to my 94 at the moment. Ironically, also out of an 02 LS parts car..
As posted by Keith Tanner:
"The front NB subframe does have some improved geometry. The lower A-arms are moved forward. The steering rack has better mounts. The front uprights have the steering arm moved up about 7mm, and the upper control arms have a slightly different taper on the ball joint and more reinforcements.
If you're going to swap the front, you ideally need to do the subframe, rack, uprights, upper control arms and maybe the tie rods - not sure about the latter. If you have those parts, it's a straight bolt-in.
The rear subframe is identical other than exhaust hangers and brace mounting points. It did let me run the stronger rear subframe brace which was good, because I planned to use the brace as a skid plate. And I did, big time. The rear uprights give an extra 5mm of track on each side, so I used 1994-97 uprights to give myself a bit more fender clearance. Again, this all bolts together although the 1.6 cars don't have the mounts on the chassis for the subframe brace and you'll find the exhaust hangers are in the wrong place for an NA exhaust."