Except for theming, the ships are identical, from the same exact set of plans for construction. That was covered in the captain's talk today, by happenstance, which had the Captain along with the Chief Engineer, who has been an Engineer of the Magic since its construction.
On that, also take time for the captain's talk when they run it on board the Magic, they first run a video that covers everything in excellent detail as to what was done to the Magic when it was in for refit and drydock last year. A lot more was done than you think...