Just hope you keep updating steam since you've stopped here for itch.
Oh, don’t worry about that. If the game gets a new update, all platforms get it. It would be weird to have such differences. The updating process may take some time though since I’m just one guy, but it’s usually a difference in a pair of hours, max. If nothing big happens, of course.
Besides, I recently added an option to get full games both for Yorna and MonGirl Expedition to Itch. So, all the platforms have identical packs and game versions between themselves.