IIR, old VW Beetles and Porsche 911's were largely interchangeable. So much so that my father used to hotrod Beetles with Porsche engines and I've seen at least 2 Beetles with 911 bodies on them.
>He[Hitler] contracted Porsche in 1934 to design and build it to his exacting standards. Ferdinand Porsche and his team took until 1938 to finalise the design.