They all look like mixed breeds. Khaki campbells don't have such a mix of colors in their feathers. They are generally one shade of brown, sometimes with a little light or dark brown mixed in. I would say yours ate a Rouen mixed, possibly with campbells.
And I don't think the black ones are cayugas. Cayugas are black but very noticeably green. If yours are green, the whole bodies not just the heads, then yes, they ate cayugas. If not, then they are a mix. I have some Swedish mixed with rouens that look like that. They are black, and one of mine has a green head.