Ping Pong, or Table Tennis, has pretty much the same rules of table tennis. The scale of the game, obviously, is the difference. The mechanics of the game are also different, but the rules are the same.
Ping pong and tennis do not have the same rules and are different games. Ping pong is played on a small table with paddles (and is often called table tennis), whereas tennis is played on a court with rackets.
