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I've heard that the male rouen and mallard's beaks turn light and the females stay dark. If you look at pictures of the adults, that seems to hold true. Also, my female pekin duck was very loud and the male was quiet. And the males tail feathers were more ornate, as in curled, than the female. But im not sure if that the same for rouen ducks. Mine are only 2 weeks old so they havent changed much yet. Although, two of them have beaks that are getting much lighter than the other. So far it looks as if you have two males. Search for distinguishing marks for their age on Google and maybe that will help.
Kind of looks like he has a mohawk here too. Must've been his rebellious teenage period.