So far, Taleworlds has not given much information on the release of Bannerlord on consoles. From what I've learned about the topic, Bannerlord will not be compatible for a while after release. I assume this is because:
a. They need time to eliminate bugs, which will take a while
b. Taleworlds is more focused on actually getting the game out for it's majority of players (PC)
c. From my experience developing indie games, trying to translate a game into a whole different system is really difficult.
If that doesn't answer your question, than I don't know what will.
Summary: It will probably be compatible eventually.
