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At that age they're both pullets. Yeah, one can have a larger comb, but it's no where rooster size. If they're not laying yet, the one with the larger comb will probably lay first.
You didn't ask about quality but because you mention they are show quality I'm going to say.........I'm not a RIR person by any means, but I think both those birds have too much of a cochin-like tail for good RIR show birds. You might want to ask someone like NYREDS or another good Red person if you're wanting to show them. If you're not, or not looking to breed, then ignore this last bit!