Kingdom's pool of players?

Are we playing people who are playing Kingdom or are we playing people from chess.com. I think Kingdom generates avatars for people on chess.com without them even knowing. 

I can confirm that we are playing with both.

And I can confirm that, because sometimes players are requesting rematch after a game, which is not possible in Kingdom app. I noticed because after a game in Kingdom receive a message through chess.com to rematch.