Roo or hen?

[Unearthed wonder]

Can anyone help with the sex of these 6 week old mixed batch of chicks? The white and black one I am pretty sure is a boy as it developed its comb very early and also very rose coloured weeks ago. The other is much smaller and developing a lot slower with a much paler comb. The comb is however, larger than I would have expected for this breed. (I am assuming it is some sort of a Mille de fleur)
These 2 were given to a broody silkie in a mixed flock that lost her 2 best friends last year. We will need to think about how to best integrate her back if they are both boys. (We can return them)
Thank you in advance for any help

 

[Sortacountrychicken]

Looks like both boys

 

[LadiesAndJane]

Agree the black and white one is a boy, the other one I am on the fence with and the rat, I have no idea.

 

[Northwest_Wannabe]

Looks like both boys to me too, also congrats on what appears to be a mouse you caught xD

 

[Unearthed wonder]

Agree the black and white one is a boy, the other one I am on the fence with and the rat, I have no idea.

I have no idea how that even got there
It won’t let me delete