The 7.63 Mauser is a direct descendent of the 7.63 Borchardt. Virtually identical but loaded a lot hotter. As a matter of fact. I have seen boxes of 7.63mm ammo that stated right on the box that it was for Mauser AND Borchardt. Not recommended.
The 7.65para is, as Gerben stated, a descendent of the 7.63 Borchardt but shorter and loaded a little hotter.
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If it's made after 1918...it's a reproduction
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