Rooms & Skins

Is there a site to find out which poker rooms share the same skin? Are they all the same for that site?I am a novice and I have 18 different rooms to play in.I thought if I could'nt get in on one site I could get in on another and I find that they share the same skin and the same amount of people are in that game also.Is that just a coincidence or if you log into one you log into them all?I believe if I got rid of some of them my pc would run better.I think my pc gets confused because I sure do.Thanks