I think certain styles of matches allow for more spontaneous changes than others. The WWE or classic All Japan styles would seem more conducive to guys calling it all in the ring--a Stan Hansen/Vader brawl being an extreme example--but if you see some of the more technical NJPW or Mexican matches, some of them seem much more rehearsed to me. Thinking back to the ECW Malenko/Guerrero matches, or those matches with 5 on 5 luchadores for example, where they're all flying all over the place.