Breed of 4 week old chick

What physical features tells you if it is a rooster at 4 weeks? Size of comb or color?
 
Here is another one I have. Same age. (Almost 4 weeks) much taller. Feathers on black legs and super duper sweet. No clue what this one is. Any help is appreciated
400


Might b a marans chick
As color right and fethears on legs
 

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