4 week old BYM cockerel pair?

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These babies hatched the same day, from BYM eggs, on March 26th.

I was reasonably confident that they were both cockerels but now I'm second guessing myself on the lighter of the two chicks. Are these two boys or is the lighter chick possibly a pullet?

 

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Here's two better pictures of the chick in question, a close-up of the comb: