The difference between the two is also this,
Europe in The Air was a broken attraction from the get-go, using technology that was more dated. I'm sure with Fallon, UC is taking steps to make sure with the manufacture that the version of the flying theatre (I believe that's what it's called) Is more up-to-date, allowing smoother (or aggressive) motions to occur, with a better system of seating.
That's a guess, but it would make sense in my book that this technology; even if cheap, will benefit in the long run.