same starter, the ring gears are the same (sorry I should have clarified), just the engagement area is 1/2" difference for the clutch and flywheel face.
I can't remember which one is 1/2 smaller, but I thought it was the 89-93. So you could in theory use the 94-95 flywheel with either clutch, but maybe not the other way.
I researched it some time ago and couldn't find where anyone was running a mix of years, but I do have a 89-93 clutch and flywheel on an otherwise 95 SC.
You could do a search for Ricardo's posts, he had some issuses at one point if I remember right.
I'm running hte 89-93 because it is the only year for the centerforce dual friction which DD recommended. And I like the clutch fwiw.