The Caprice wagon core support, fenders and, hood are the same (some holes need to be drilled in the fenders for the trim).
The wheelhouses differ slightly. The bolt holes for attachment and accessories are different. for 91-92, 93, and 94-96.
91-93s have different airbag sensors on the core support vs. 94-96
The bumper support (metal part) is different as are the associated cover and shocks.
The grille and its brace are different as well.
The sedan front end is all different except the core support is the same.