Need help sexing my birds

[Jayboss]

Hi guys,
I have the two birds among my flock of cuckoo marans, I believe they are white marans, but at 4 and half months, I don't know what gender they are....any help pls....
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The pics above are the two birds......

 

[Tiana's chickens]

It's hard to tell because they are at the age where some pullets have started growing combs because they are coming into lay. Do you possibly have photos of them a few weeks younger?

 

[Chicken Girl1]

Where did you get them? I'm thinking they are cockerels.