I hope you mean MS Store version and not the actual physical disk version?
If you buy the MS store version, do it while you have a game pass subscription. This will give you a 15% (iirc) reduction.
You shouldn’t need to re-install it and all your marketplace-bought addons keep working.
Make sure you select the correct version! Premium Deluxe is now pretty actractive, given the 787 will receive a huge update soon and you get a permanent discount in the marketplace for 1st party aircraft.
Gamepass has the default version included. If you have the Deluxe update, you would have paid for that at some point.