The only difference between Vegas and COD is how the spawning works.
You still have trigger points in vegas, like Cod. Then the mechanics of the game change it. KZ has cover, but it doesn't have squad, which means the mechanics are some way between COD and Vegas, but that's besides the point.
My point was, alongside with trigger points in KZ, you also have the spawning that according to what i read/heard, works like COD, you have to push forward.