What concerns me here is that wheels from a ZR1 that are not factory ZR1 wheels may not have the factory offset - it appears that we're looking at Fiske aftermarket wheels with a 56mm offset and not factory wheels.
If that is the case, they ought to fit just fine.
The offset controls whether the wheel/tire sticks out or not.
The standard front wheel on a ZR1 should have 56mm offset while the 11" rear wheel should have 36mm offset.
The standard wheels on an '89 should have 56mm offset.
The 11" rear wheel on the '96 GS had 50mm offset - this allows the GS wheel to fit farther under the fender of a standard C4.
Since the wheels in question are not factory wheels for a ZR1. we can't say whether they will stick out or not. If they are 56mm offset, then they will fit under the car even farther than the GS wheels and there may be clearance issues on the inside.