8 week old silkie bantams - any guesses on gender?

[AllyCat16]

First close up picture is of the smaller chick, and last picture is of the larger chick. Also a side by side comparison of the two… the larger chick is definitely more standoffish and pecks me more… any guesses on if they’re a pulley or roo?

 

[OneLostHen]

Total and complete guess but I think the smaller one is a roo and the larger one is a pullet.
'Her' comb is smoother and her tail looks more round in the group photo.