Are we boys?

[Iheartchickens7]

Hi
I have 4, 4 week old cochins. These two suddenly look quite different from their roommates. Just wondering if anyone can tell me if they are definitely little boys. This is my first time raising chicks so I am just learning. Our first batch were pullets but this group was straight run so I am just curious. The last picture is one of the chicks I am comparing them to.
Thank you!

 

[BlueCamas]

Only the first 2 look like cockerels.

 

[Iheartchickens7]

That is what I thought. Thank you!