Depends on the player
I have a few cues that I switch back and forth between whenever I want. Some people don't understand how or why but I have no problems. They're also pretty different in that one is very forward balanced with a piloted ss joint and the other not so much with a flat faced elforyn joint with a radial pin. I was just at my state tournament and hadn't played with my Runde in some time and the second day of play I pulled it out because the facility was so warm and humid I felt the forward balance of this cue helped me move the ball around easier, and I played great. One big similarity with both cues is the fact I use a Jacoby Edge Hybrid on both so for me it's just the weight, balance, and stiffness of the hit that I'm adjusting to, I think it would be harder with standard shafts as they can vary in a lot of different ways. It can still be done but I would find myself down on a key shot that I really need to juice and instead of concentrating on the shot I'd be questioning my confidence in the cue. All you can do is try em out, I know I would, and see if you can be 100% confident with them and if you are then no worries. I may be in the minority tho as at last years tourney I bought a new cue mid tourney busted it out for the next match and we took 2nd in open teams. I also always have a new tip put on at these state tourneys and play just as well, but I'm just a lowly A player in the BCA. Hope this helps, enjoy them new cues, and get to practicing!
Give em hell at state, Ben