>>50256644>>50259638The only issue is that the total number of tiles and palettes are split differently between tileset 1 and 2. This makes importing complete tilesets from one game to another a bit tricky but individual tiles can be copied over easily. It's also possible to change how the tiles are split if you're using decomp.
Ruby and Emerald have the same tileset size but Emerald appears to have one additional palette for tileset 2.