I believe the answer is no, but think about the MARVEL and DC universes, lots of dumb stuff happens that people have to keep reorganizing timelines to make it all happen right even though TECHNICALLY they are in the same universes/multiverse.
There is most likely hidden lore to be gleaned from each dev as an easter egg and also a head nod to the others. No relation though, just for fun.
If all the best NSFW VN devs worked together to make one VN... Itch.io, Subscribestar, Patreon etc. couldn't handle the amount of instant downloads. XD