Correct; I've run two in the past. If I ran another, the mechanics would be similar, but the roles would be different (based on player count) and I'd simplify the selection process.
https://www.purediablo.com/forums/threads/night-of-the-living-wifoa-game-thread.841305/
https://www.purediablo.com/forums/threads/city-mafia-game-thread.824479/
https://www.purediablo.com/forums/threads/night-of-the-living-wifoa-game-thread.841305/
https://www.purediablo.com/forums/threads/city-mafia-game-thread.824479/
Google