I have a sort of "alternate tileset" to this grass, for example. The way it works is that the grass fades out to reveal this alternate tileset that exists underneath. The alternate tileset is the exact same as this grass tileset, but recolored.
In order for this to not be jarring, the arrangement of tiles needs to be exactly the same between these two TileMaps, but to do this manually would be rather painstaking. Is there a way to copy the arrangement of tiles?