I think you could achieve this best by setting up some Visual Logic to choose/set the visibility of those XXX, YYY and ZZZ elements. So that would be 1 scene with a 3 groups of objects for your needs (or as many as you wish). Then in Visual Logic you could use a String Compare to toggle that visibility for each group.
Then it's just a matter of executing some normal transition logic of the scene animating in and out. If you wanted some Back-to-back functionality you can run some conditionals to check against the incoming scene and that selector field if it needs to do something else.
#XPression