M91 mosin compared to M39

Very short explanation might go like this:
M91 is a Finnish modification of original carist Mosins.Diffrences are sometimes minimal,some involve more work like rebarreling etc.
M39 is a very complex redesign of M91 and later Mosins where pretty much only action is left alone,however even this is not always the case.

I hope i got that right.
 
M39 is short, M91 is long :D.

Seriously though, 7.62x54r.net and mosinnagant.net will be your best source for full descriptions of the two rifles.
 
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