There’s several variants of both Mother 1 and 2. There’s Mother 1 in Japanese, if I recall it has several localizations, including the official one “Earthbound Beginnings” which you can find on the Switch NES Online service; I understand a proper localized patch is the preferred path, but every time you google these things you get a different perspective.

There’s also several Mother 2/Earthbound ROM hacks and localization patches to consider. Last year, I played through “Mother 2 Deluxe” which does seem like a definitive edition.

I just started playing https://pkscramble.com which is one of several Earthbound Randomizers out there. Randomizers are fantastic to break up the monotony of a play through, throughly recommend.