What I'm intrigued about is the dark eyes rather than just the single comb. Wyandottes and most production blues do not have those. The single comb in conjunction with dark eyes and lack of yellow skin leads me to believe you have a Blue Australorp (or potentially Blue Orpington) along with your...
So they both have yellow bottoms? :) I am confident the one with a rose comb is a Wyandotte (assuming yellow skin) I am just skeptical that the other one is just one with a single comb
I think you have two different breeds going on. The one with the single comb also has dark eyes. What is her skin color? I'm thinking Blue Australorp and the rose comb one actually being a Wyandotte