Small Parts - Do They Really Match ?

Is it possible for a Luger that is advertised to have all matching parts be a hybrid of different small parts from different guns which coincidentally had the same small parts numbers ?


For example if a Luger (s/n 4790) was missing only one small part with number 90, what prevents the Luger from being fitted with another small part from another "junk" gun that, let's say is s/n 8690 or a small part found in a parts bin at gun shows ?


I assume the importance for all matching nubmers is a confidence that all parts belong to the same gun at time of manufacutere and were hand-fitted for best shooting performance.


Pete...