zum would zay a MUTT........and that a real Easter Egger iz an Ameraucana bred with another Ameraucana of different feather colouring to give you a non-standard variety but one that will ztill lay u a blue egg. Otherwize, once you breed their (the combo you suggested) offspring to another non-blue egg layer, you risk the outcome of offspring with muffs and a beard who lay brown or white eggs (whatever the colour egg gene the rooster is) and therefore no longer an Easter Egger.....
The real question is, do you know your Ameraucanas are actually purebred Ameraucanas?
Ameraucana crossed with anything but another Ameraucana of its color is called an "Easter Egger," a mutt, however most places such as ANY hatchery, feedstore, and most local backyard breeders sell such mutts, despite whatever claims they make of them being Americanas, Americaunas, whatever you call them.
So, if you have Easter Eggers, then you'll just make more Easter Eggers, no matter what you breed them to.
If you have true Ameraucanas, then, you'll make Easter Eggers if you out-cross them. If you do Ameraucana x Ameraucana, you get Ameraucanas.