They absolutely are not and you are lucky you were able to get your save game out. The majority of games have their config and save files encrypted and are completely unusable as far as any other platform goes.
There are some exceptions, mainly games that have official mod support tend to have areas you can access but the majority of others won’t.
Well you aren’t going to be able to pick out a trend with only testing two games. Its enough of a problem that I would double check where the save is before starting a game on gamepass.
The last game I tried to move and failed was snowrunner I believe.