I’m not an expert, just a Pennsylvanian. I believe it may be Berkeley Polypore. I have a large one, the size of my 4 year old that grows on an oak next to my house.
They have been known to get much larger. I removed it from the tree before it could grow any more. They cause butt rot in oaks. It’s very large tree close to my home, I don’t want it dying anytime soon.
I don't know, I just thought they looked kind of similar. You're right about the color. These don't look like the typical chicken of the woods that I've seen.