Pretty sure this is preferred over fixit nowadays: https://www.nma-fallout.com/threads/fallout-et-tu-release-v1-4.220052/Fallout 1 and 2 are the best in the series, so yes. Although I can't speak to whether the Game Pass versions are moddable. There's a bunch of mods that come with the GOG version that allows you to choose a higher resolution, among other QOL bug fixes.
EDIT: Fallout Fixt is what you want. https://falloutmods.fandom.com/wiki/Fallout_Fixt