Duckling breeds?

[Antcohan]

I got 5 ducklings from tractor supply Saturday and don't know the breed the sign on the tub they were in just said ducks. Is the one with a siver/black color head and feathers with a dark beak a different breed?

 

[Khota]

I think the completely yellow ones are pekins and that the one with the silver head is possibly a welsh harlequin.

 

[Antcohan]

I think the completely yellow ones are pekins and that the one with the silver head is possibly a welsh harlequin.

Thank you