Hi,
It depends on what you see as a 'new Mauser frame'. The postwar Mauser Parabellum frame can be used, but needs some adjusting to function properly. The shape of the stop on the receiver bottom is square on a Mauser Parabellum and rounded on a prewar Mauser/DWM/Erfurt.
Also the Mauser Parabellum has a long frame.
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