Some, if you look at casting and narrative choices, not to mention set pics.
For one, the situation in Meereen itself is very likely to be different. The Green Grace, prime candidate for the Harpy hasn't been cast, neither has any of the other important Meereenese courtiers, such as the Shavepate or the Perfumed Seneschal. So that plot line will be different, likewise there's been a conspicuous absence of Ser Barristan during the set pics of Drogon's attack and several of the action set pieces involving Daenerys, with some speculating that Barristan will be the one who is poisoned instead of Strong Belwas and that Daario will take up the role of the Hand of the Queen. Likewise, on the Sellsword side of things there's no Brown Ben Plumm or Tattered Prince in the show, which wipes away another few players and alters stuff in regards to Tyrion and Jorah. And as GRRM has pointed out, Xaro Xoahan Daxos and Pyat Pree are dead in the show which causes a Butterfly Effect given that the Qartheen fleet are another major threat in the Battle.
And then there's the Greyjoys, or more specifically Victarion and Moqorro. Admittedly, we don't know what the situation is with the Greyjoys, as there've been conflicting accounts as to whether they've been removed from the show entirely or if (as some places have reported) that Victarion and Euron are simply being pushed back to season 6, in which case would be feasible to accommodate that aspect of TBoF. But if they are removed, then that also takes out Dragonbinder which is the fuse to set off the ticking bomb that is Rhaegal and Viserion.
It's too early to tell with any real certainty, but just looking at the facts that are available now, a good majority of the important players have been removed or shifted. So if we do get something like that, then it'll be greatly reduced or straight up it's own thing. I could be wrong, and I hope I am, but it's a hazy situation right now.