I bought this the other day, and wondering if the available tiles are the same across each version? The base tileset seems to have more water and inside items than the RPG Maker stuff. Also I saw some more inside-house tile options in the base set than the RPG Maker sizes.
Some graphics didn't fit on the RPG Maker sheets because of the size limitations, so the general sheets might have some extra stuff. If you're using RPG Maker, you're welcome to edit these pieces into the RPG Maker-compatible sets.