Phil, there were many small changes over the years, minor design improvements, bug fixes, different base materials (steel types), subcontractors, etc.... Some more obvious than others.
Mauser first used up the parts that came from DWM before they started producing themselves, and inbetween there is some overlap (and some DWM parts stock at Mausr lasted for a long, long time).
New standards and new machines and tools also had their effect on the overall shape of individual parts.
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