How come wrestling is different from boxing, with the fact both have different companies?

Professional Wrestling is scripted, Boxing isn't. The two are really different if you compare them. Basically Boxing is just fighting with boxing gloves and you use your fists, while in Wrestling you go on the top ropes, on the top of the cage and you fly off and hit the wrestler with your move. In Boxing however you can only stay in the ring and the ref can make a standing 8 count. It was originally designed to protect boxers by allowing the referee to step in and give an overwhelmed fighter an eight-second respite.