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I've never tried it but I would think the length would be different so it wouldn't crimp where you wanted it too. As well I don't think the 8mm neck would crimp well in a die meant to hold a 7.62 diameter projectile.
Unless you are shooting a heavy bullet in a semi-auto (or a light bullet with ball powder) there is no need to crimp. I have never crimped a 8mm round.
Did you check if your seating die has a built in crimp? Not every brand does, but several do. A roll crimp will need a cannelure, otherwise Lee Factory crimp die is the only suitable option. No crimp is probably fine however.
Unless you are shooting a heavy bullet in a semi-auto (or a light bullet with ball powder) there is no need to crimp. I have never crimped a 8mm round.