Different versions of games always have subtle differences between them; if a developer has an opportunity to improve something or make something more relevant to a new audience, they'll take it. That's just what Nintendo did in Super Mario 3D All-Stars, tweaking the controls, adjusting textures, changing words, it's all game.
We've been digging around and have found 35 changes between the new Switch versions and the original NTSC versions. We've chosen the NTSC versions because we've got to choose something to compare to, and who even likes PAL?
So point your vision balls at the video above to see all the wondrous changes we've found. Buh-bye!