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I've never seen such a thing happen. Really, before someone would think it to be so, they need to look at the recognized colors of Ameraucana, look truly at the SOP, and see how close their EE really comes to that. Also, leg color. I rarely see EE's with proper leg color AND plumage color. There are plenty people around who, for some reason, think their EEs are Wheaten or Brown-Red Ameraucanas. Big difference.
Anyway, on the light side, if your EE really does match it, then the question is - Do you know its background? Does it match ALL criteria? You may be able to call it an Ameraucana if so. Because really, if you know it is crossbred, there's slim chances it will look like an Ameraucana. If you don't know its background, sure, it could possibly be an Ameraucana.