What breed of ducks are these ? And sex

[Little duck farm]

Hello so my ducks are 7 weeks old, I was told they are Cayugas and as you can tell by the pictures attached they do not look like cayugas ? So just wondering if anyone knows the type of breed they are? Also sex? Just the 2 the one I’m sure is a Cayuga and the other KC

 

[chickens really]

I see Rouen Ducks actually...Cayuga too..

 

[chickens really]

Hens Quack loud and Drakes Rasp ...