They look like a rumpless cross, possibly Araucauna. You will have to clip their tails (quite painless) if you want them to breed naturally. The "birds of a feather cling together" is natural in many species. I have seen goats having twins taking after 2 different breeds reject the one that is not like her. However, when a doe resents another doe's kid stealing a feed, she will butt it or chew its ears. W hen she rejects her own kid, she will not attack it but walk away from it.
Sometimes strange things come together. I had a chicken hen and a guinea hen team up. Every morning they would take a stroll together from the barn behind the home, past the home, up the driveway and back.