Hi!
This tileset is considerably more complex than the dungeon tileset, and because of that the layout of the tiles is different, but both are arranged in an 8x8 grid (like the rest of the collection).
If you open the tileset and overlay an 8x8 grid on it, you will see each element is correctly divided following the grid.
Here is a small portion of the tileset so you can see what I mean.
I hope this answers your question. If you have more questions please let me know :)