Are these silver appleyard ducks?

[asareboadu]

I have these buggers for a while. I was told they were silver appleyards. Needs someone to confirm them for me. Especially the color of their beaks

 

[Quatie]

They look like they may be golden 300. They can look very similar. The golden 300 tend to have darker legs, while the silver appleyard will have yellow legs. Depending on where you got them, if they are first generation, they are sex linked. Black ducklings of the golden 300 are drakes and brown are female. They are no longer sex linked after the first generation.