For the reasons above, I don't think you could accidentally reload a 9mm mak as a .380 and chamber it in a .380. (A 9 x 18 mm makarov won't even fit into my .380 acp shell holder.)
Of course the question then becomes: Could you intentionally use a 9mm Mak case to load 380's? It would depend on the tolerances of your breech face, extractor and chamber, but I think you could do it with some case modification and a lot of work.
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