I’m feeding the ducks ducks pellet feed and the chickens all flock raiser but the ducks eat the chickens feed and the chickens the ducks. Go figures. I can’t win. I’m not sure if I could jut feed them all flock and if that enough for the ducks and I wouldn’t have to supplement the ducks dietIt has never caused any problems with my adult ducks, roosters or drakes. But then they also foraged for insects and slugs and ate the grass so maybe it formed a smaller proportion of their overall diet?
I don't keep ducks atm but when I did they lived in a mixed flock with the chickens so there was no way I could keep their food separate.