I'm confident that 2 of the ones I picked are KC, but the 3rd I have no idea. It's bill is larger and has pink around the edges. It's feet are splotchy black and pink (where the KC's are just black at this point). It also has a more blue cast to its down. It didn't look like any of the other ducklings in the bin. I'm new to ducks (not new to chickens) so I've been reading a lot. Hahahahha.
Compared to the 2 KCs....the one in question is the one furthest to the left.