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Definitely sounds like two different kinds. The rose combs are most likely Blue Wyandottes, because that's the only common breed with a rose comb that comes in blue. The single combs still have several possibilities, and I don't personally have the knowledge to sort out which one, but all of...

Yes yours have rose combs, like Wyandottes are supposed to.

Some hatchery "Wyandottes" do have single combs. It has to do with the genes involved, but it's not particularly rare. But the ones with single combs could just as easily be one of the hybrid types with blue feathers who lay brown eggs, that have been showing up in stores and hatcheries...