I agree too with them both being a Cornish X's.
We have a chicken houses across the road that raise them for the poultry farm. In the past, after the houses would get collected there would always be a few who didn't get caught and just left behind. If I ever saw one I always took it home (with the owners consent) since they were pretty much left to fend for themselves, if they made it through the night that is. They will get huge, they are "programmed" to eat, drink, eat, drink. I had to put the food up higher a few times a day & at night, the others could get to it but the CX couldn't, making her get out of the coop and "exercise". If you leave the food accessible all the time they will continually eat, eat, eat... and not stray far from the feeder. One, Clover, had gotten so big she would wobble when she walked, so sad. She lived for only 10 months, she was already month old when I got her. Another one, Squeaks, I "rescued" only lived a few months.
I decided no more I found it to sad.
I know yours may not have come from a chicken house, but I agree that this breed is a weight gaining "machine".
As for your question, that one does appear to be a roo.