Just make sure the tank water and the bagged water params meet closely on temp, SG/Sal, Ca/Alk, etc. The more params the closer to each other, the less necessity for acclimation. How far are you going and will you have control over the new tank before you start moving your corals? When doing a full move, it is many times easier to acclimate the tank to the bagged/bucket water than the other way around...
If it is a short move with little param change in the buckets/bags (i.e. no ammonia build-up, no O2 deprivation, no PH changes, no large temp swings due to transport), then it should not be too bad of a changeover. This is a good time to make sure your sand/rock is not building up nasty stuff by either mixing in new sand with some of yours for seeding, or by moving it and shaking it and getting all the crap that gets kicked up out through water changes.