Your babies do have the two lines, one right next to the eye, then one below. The chicks in the first pic do not look like EE's to me, though I have no idea what they are! The last chicks look more like a Barred rock and a RIR. The barred one looks like it has a straight comb (from what I can see), which would be BR, not dominique. The middle pic could possibly be golden sebrights? Though I'm not sure.
About the only difference between rouens and mallards is their size.
About the only difference between rouens and mallards is their size.
