interested in knowing this myself. i asked
ABD this and was told it's usually basically the same intinerary but an adult group can also skew the specifics, for example you'll be around Location X, but the group may opt to go to the local pub instead of the pool or whatever.
ultimately i opted against adults only because even though in my case with the backstage magic tour i would have appreciated an edge they may not offer to a group of 5 year olds, i still wanted to be able to take full advantage of everything they offer the kids anyway since i'd rather color than drink beer any day.