There are some differences in the current tilesets up to now:
in my opinion "normal" are:
Forest, Evergreen, Autumn, Mediterran, (New) Winter , desert2, jungle , hell are all the same
Some kind of unusual are the following:
In Winter_forest the water object ( reed and so on,which is ice in winter_forest ) is not walkable !
Dark_forest, scrubland:
Custom 1 Object is walkable! ( Custom 1 is something like Tree/DeadTrees/Ilivetree/DeadPalm... )