One of the versions should work for foundry, roll20 just had some strange settings I needed to get around to get them to work.
If none of these work, let me know and I'll make a version that will.
So I got this working. You can just use the Roll20 version of the tiles, and in the Tile Controls > Tile Browser, just make sure the 'Asset Grid Size' is set to the width of my tiles (484px). Then they just slot into place.
Does this solve your problem? I'm happy to export them differently if it is helpful, but this seems to work.