I'm going to go against the crowd and say the one with the yellow shanks is a pullet. This is assuming that one of the parents had yellow shanks and the other had slate or light shanks. It's possible for a pullet to also have light colored shanks from that pairing, but no boys should have yellow. Because of that, I'm also going to guess that the one that is the same color and pattern as the one with yellow shanks is also a pullet. Take that with a grain of salt though, as I'm no expert on the subject.