Duckling ID?

[Moonspeckle]

I purchased two ducklings at my local TSC and they were unlabeled. I didn’t realize that there were a few different duckling breeds that were brown. Could these possibly be khaki cambells? What things do you look for when identifying ducklings?
I can provide more photos if needed.

 

[nchls school]

It looks like they could be khaki campbell.