I'm guessing that when most P08 parts were originally manufactured, they were "interchangeable" with most other P08's. However the Luger, being a "fitted" pistol vs., for instance, a Glock, which is an "assembled" pistol, went thru extensive fitting on each part, was then numbered to that particular gun, and at that point may have become unsuited for use on another P08.
Just my $.02.
dju
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