70 Gs parts compatability

Wondering if anyone could tell me if any body and interior parts from a 72 skylark custom are compatable with a 70 GS. Without turning my GS into a clone, fenders, doors, and so forth

Most parts should be compatable between the 70 and 72. Obviously, some GS specific trim and badging will differ. Interior trim also is a bit different. But most of the doors, fenders, engine are generally interchangeable.