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I honestly wouldn't recommend going by appearance alone to try & establish the species, I would be surprised if hamsters in pet shops there don't come from mills, have you asked where they source their stock from?
Appearance can be very misleading as any genes can dominate giving the hamster the look of one species or another but that's no guarantee at all.
I really wouldn't worry about where your hamsters come from & what their genetic background is now you have them just enjoy them!