Randall Gibson, in his legendary book on the Krieghoff Parabellum, pages 28-29 gives one of the best answers to this question around, IMO. You have already mentioned the major difference: the Muuser stock lug has deep indentations on each side of the upper part of the lug. Gibson theorizes that the factory used the lugs to attach the frame to the machining jig to enable all the shaping to be done to the frame. Thus the stocklug, after 1918, and except for carbines and other long barrel models, was a manufacturing aid and not especially for attachment of stocks.
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