It's hard to compare to Orp temperament
I think Ameraucana are rather impressionable, as part of being aware and smart. We raised our first Blacks from John Blehms line with a slightly older E. Orp cockerel who acted like a big sweet daddy to them. They all grew up very calm, whether genetics or his Orpy influence I don't know. That same year, we got some Isabel hens from a nearby breeder and two of them were very friendly, in your business sorts. Susie, who we still have, just follows us around and wants to stand on your shoes. Her daughter Dovey is just the same, crossed with the blacks she came out a really nice lavender (clean feathering). As a chick she just looked up at me and was like "Oh, food bringer! I like you" she made herself a pet despite me and would fly onto my arm. As she got bigger I had to discourage it for the sake of my skin, lol.
So I'm saying, they might tend towards nervous if they see other birds acting nervous. If you have room, perhaps you can raise the next batch with your Orps? That would prove whether it was the line or not anyway.