well, if you mean "Littlefoot with his parent - being without his friends - joining friends - travel - great valley" sequence, then well, there's some mirriring, partly.
That's what I mean. Even the part when Littlefoot and Cera fight is mirrored.
I also noticed the similarity...Littlefoot and Cera fight, and then the Gang splits up, with Littlefoot on his own and Cera leading the others. I thought that latter detail was kind of an absurd thing to rehash. (Ducky, Petrie, Spike--what on earth are you guys siding with Cera again for?? You've learned how that goes!) If there was one problem I had with XIV, it was that.
Fortunately, though, that was the only big problem I had with XIV!
I enjoyed the rest of the movie enough that I was able to roll my eyes at the rehashed bit and move on. Ever since the franchise seemed to end on the disappointing note that was XIII, I'd been dreaming (sometimes literally!) about a new LBT movie happening, so finding out XIV was going to happen, anticipating its release, and finally getting my hands on it brought back all the feels for me!