I thought I had heard something like that, but honestly I thought it was leg color, which I could not confirm. There may be a difference in skin color as well, white vs yellow, but I am not sure if this is accurate or which one is which.
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From what I can find, their legs look the same.
I have a hen that I was having trouble deciding if she is a Black Australorp, a Jersey Giant or a Black Sex Link. I have 6 other BSL pullets that are 18 weeks old and I think I have decided that one hen is a BSL as well.
Not much help with you...