I think a disco is essentially a 95 RRC except the body. You have the 10 spline axles in your 92 vs the 20 spline in the disco. Brake system is diffrent but the calipers are the same . I think the ecu is the same but it is easy to check it will say 14cux or something, you can check if it matches your RR. Looking for a lt 230 myself, same tranny and same 3.9 as a 1995 RRC.
There is a difference as to what will work and what is a direct replacement of. Virtually all the mechanicals can be fitted as a direct replacement or as a substitute for a complete assembly. The dash, etc will fit if you want to. Seats, etc will fit with minor work. About the only things that are not moveable are the chassis and body panels.