The birds at PP are almost all 'wild-type'/partridge colour, that lay green eggs, and cannot be called Ameraucana as partridge is not a recognized APA colour and the standard calls for blue eggs (I believe). Many also have green legs, which speaks to something else in there, likely sexlink, to increase laying ability. Amers must have slate or black legs. PP birds are all Easter Eggers. Some people would say, "well, if you cross a buff Orpington with a black Orpington, the chicks are still Orpingtons", which is true (though not to my own mind), but it's comparing apples to oranges. With Ameraucanas, they are a relatively young breed, and different breeds went into creating the different accepted colours, so there isn't a clear, across the board "Ameraucana gene". Even keeping colours separated, throwbacks still happen, and serious breeders are working very hard to get their birds sorted to where they will breed true without a load of effort...these breeders will sometimes take great offense at a black EE with colour leakage (for example) being called Ameraucana, because they often see it as a money grab, taking away from their years of hard work when there's still so much work to do. So much in fact, that many starry-eyed breeders give up, especially when they discover how hard it is (and getting harder) to find unadulterated stock.
The bird they use for a picture on the PP website is a silver, which IS a recognized colour, but I've yet to see any EE chicks from there that were a recognized colour. That said, PPs EEs are perfectly fine backyard chickens if you'd like some green eggs. Just don't call an Orange an Apple in the wrong company, because some of the more, erm, passionate Ameraucana officionados will rip your head off and

down your neck :o