Stan,
1. The ZR-1 has it's own unique Vehicle Identification Number
2. The rear end is 3 inches wider than the standard Corvette
3. The ZR-1 was built from 1990 to 1995 with the unique LT5 engine which only came with RPO ZR-1.
This is three major points in a nutshell. For much more detailed information, see our
1990-1995 ZR-1 Center