It's very different. This is taken directly from the website.
WHAT ARE THE RULES?
WCL Contests feature fast paced STRIKING action with a premium placed on All Kicking skills directed at targets above the belt are allowedathletic kicking skills. There is no holding, clinching, throwing, grappling or wrestling. If a fighter tries to slow the pace of the fight down by holding, avoiding, or not fighting in an aggressive manner, the referee will call passivity against that fighter and award his opponent a point. Ideally, each round will feature two "stand-up" fighting, martial arts specialists in "full throttle" action trying to score as many points for their team as possible. Three judges score each round based on knockdowns, extent of damage inflicted and the number of clean scoring strikes landed. Each judge will award five points to the fighter they see as superior, and four or less points to their opponent. The judges' points are combined at the end of each round (15 points max. not counting penalties) and then are added to the team's total from the previous rounds. When a penalty is given, a point is awarded to the opposing team. The team with the most points at the end of the second half wins.
WHAT FIGHTING TECHNIQUES ARE ALLOWED?
* All punching skills; including spinning backfist directed at targets above the belt
* All Kicking skills directed at targets above the belt
* Roundhouse Kicks directed above the knee on the opponent's lead leg, as part of a combination attack.
* Knee Strikes to the body and head if executed without the use of holding, neck wrestling or clinching of any kind.
WHAT FIGHTING TECHNIQUES ARE NOT ALLOWED?
* No Throws, Sweeps or Takedowns
* No Wrestling or Ground Fighting
* No kicking the opponent's rear leg or supporting leg, or either leg below the knee
OTHER WCL RULES
(The actions listed below are subject to immediate penalization as a way of encouraging constant activity in each and every round)NO CLINCHING (intentionally tying-up your opponent's arms in an effort to stop them from punching)
* NO HOLDING (grabbing the opponent's body in an effort to stop them from attacking or countering)
* NO STALLING (intentionally delaying the action of a contest in any way)
* NO PASSIVITY (retreating or circling without striking - or fighting only when the opponent attacks)