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I may be wrong, but I think...
Araucana is a RUMPLESS bird, easy to spot that, lays a blue egg, has face fluffies.
Ameraucana is the result of America taking the Araucana and tweaking and whatnot to arrive at a standard that breeds true (in the many variations) and has face fuzzies. There are breed standards for Ameraucana chickens, they all lay BLUE eggs.
And EE, Easter Egger, has two definitions.
1 Any chicken that's PART Ameraucana (maybe Araucana too I don't know?)... a mutt... because these are mixes they could lay just about any colored egg... 'cept maybe white, don't think I've heard of that happening... but anything from light light brown/aka pink to medium brown like a plain old barred rock... (think it's the roo that carries the egg color genes? Thus if the daddy was a brown layer and mom was the Amer then maybe you'd get brown laying chicks???) from light minty green (blue layer to light brown layer) to deep camo green (blue layer to DARK brown layer)... it's the face fuzzies that really tag a bird as being at least part Ameracana (or Araucana though the missing tail is more obvious to me)... but unless you know exactly the bloodlines or you get a perfectly blue egg, it's hard to tell if it is a 'purebred'... especially since EE's have been known to be passed off as purebreds... and no one's the wiser until that egg pops out green or brown.
2 Any full blooded Ameraucana that does NOT meet the breed standard of perfection... they're nifty to have around, don't need to dye your eggs they'll already be blue, but can't make a living off showing or breeding that chicken.
If you do a search you'll find plenty of topics on this, with much more informed people doing the answering... if any of those peek in here and see I botched something PLEASE let me know so I don't keep doing it...