Idk... The setting is different but origins and odyssey where near exact copies just in a different setting
I expect it will be quite similar, although they have said theres less "going to ? on the map, one by one" style of gameplay but ultimately I imagine it will play much the same, I guess you'd sort of expect that though, I mean most sequels tend to play much the same as their prequels. Like the Bioshock games, or the Borderlands games, or the Diablo games or GTA games or the Tomb Raider series and so on. The aesthetics change but the general gameplay remains mostly the same.
Valhalla completes this trilogy of the AC "reboot", so I would imagine if there are to be any alterations to the gameplay, it will come in the next AC title using the possibilities opened by the new game engine that it will be using.