one on the right is probably a pekin. the one on the left, i'm not sure but i had some buff ducklings that looked like that. but if they came from ideal its possible they might be snowy mallards. (where the feed store probably got them from)
My guess would be 1 pekin and 1 Runner- as for colour- it looks to have very light markings that include eye stripes - almost looks like a saxony duckling at this age- but unlikely to be any of them at a feed store.