I received 2 of these chickens in a ornamental layers collection from Mcmurray. They are gray with a small amount of rust on their breast. They are small birds.
I was going to say silver pheonix too, but I thought they had slate colored legs? Mine does (she was sold as a pheonix mix):
And in the pictures in the breed index all show slate colored legs
Then I was thinking maybe a silver grey dorking, but they have white legs and extra toes, it doesn't look like yours have extra toes and their legs are yellow. Maybe hatchery quality pheonix just have yellow legs. I do agree they both look like hens though....