Wiring Differences 88-90?

[SuperBuick]

Hey guys - as part of my resto of the 1990 Quad4 Cutlass International, I'm looking for a pristine-ish "donor car" (to either use the body so I dont have to spend a ton on painting the 1990) or for the unobtanium trim bits etc.

I did a body swap on my STE restoration - so it ended up with the 1991 drivetrain but I used all the 1992 electrics (the body harness and underhood (non engine) harness was different from 1991 to 1992, but the engine wiring was the same, so it worked out well.

One of the cutlasses Ive found is a 1988 (2.8 auto).  I know obviously the engine harness would be completely different from a quad 4 to a 2.8, but does anyone know how different the "other harnesses" are from 88-90?  like the underhood fuse stuff, interior stuff (assuming same options of course), etc?