Danielle or Danny?

Hi guys!
I picked up 2 ameraucana (well... I was told ameraucana but have come to believe they're actually eager eggers) at 6 wks, and have a sneaking suspicion that one is actually a cockerel. I'm a total rookie (this is my first post, even!) and my knowledge is entirely based on what I can get from BYC forums, so Id love some expert opinions. S/he massive bossy britches, has mahogany splash feathering, and a pink comb. Sister chick has none of these features... Danny/Daniella does NOT keep still. I've tried for some clear shots of the comb, feathers etc, but hokey doodle!

 

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Whoops! Here are the other two pics
Much appreciate any help at all, sister is super attached so I'd be sad to see them separated... however rooster crows would not be appreciated by the neighbours...