Good plan. and they maybe a mix only time will tell. Be sure to post pics as they grow and feather in, they sure are cute.The horse shade has 2 separate areas with a fence in between and a door. I think at 1 time part of it used to be a dog kennel. It has a cement floor and chain link all around. But I wasn't going to put them together until the ducklings were big. That's how I introduce new chicks, I put them where they can see and interact with the other chickens, but the big chicks can't get to them. By the time I let them be together, they are used to each other.
The feed store said the breeder told them they were pekin X cayuga.