Not quite sure which version i used with some friends. Iirc it was DF 3.2A and 7D2D 19.2. But when we new players wanted to join, that already had 19.3 installed, we tried to update from 19.2/3.2A to 19.3/3.3 and that absolutley wrecked the map.
Haven't tried other versions but my conclusion is, when playing darkness falls never update anything if you want to continue playing your current game. (also never try to load a darkness-falls-world with 7d2d-client that is of any other version).
When updating 7d2d while using darkness falls, always create a new setup. Don't try to update that client that already has installed Darkness falls. Create a vanilla checkout of 7d2d and then install the latest Darkness Dalls to ist again.
By just copying over a newer Version of Darkness Falls there may remain old stuff in the mods-folder that can break the game.