Hi,
Many smaller parts can be exchanged. The shape of the frame stop, the thick piece underneath the chamber is different in size and shape. The prewar version is rounded, the postwar Mauser one is squared. I have tried side plates, ejectors, sear bars, etc.. They can all be exchanged without problems. The toggles are pretty close and it won't take too much effort to fit a postwar toggle on a prewar gun and vice versa.
The grip construction differs, but the Swiss-style frames do accept Swiss 1929 grips.
The difference between the models is rather small and mostly of a visual rather than a technical nature.
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