They are incompatibile because of how module system works. Any new script, new menu, any change to troop etc will be save game incompatibile.
The only safe changes are changes to dialogues and items (and even that is not always true).
But unless You are betatester I would wait for the next version and continue playing game You already started unless You are very early in the game.
The only safe changes are changes to dialogues and items (and even that is not always true).
But unless You are betatester I would wait for the next version and continue playing game You already started unless You are very early in the game.