we also have different rules for a cards game called 'klaverjassen' (i think its called 'spades' in english)

i live in alkmaar, close to amsterdam, and studied in amsterdam where i played the game a lot

my gf studied in leiden, close to rotterdam, where she learned the game.

there are 2 sets of rules, the amsterdam type, and the rotterdam type, everyone in the netherlands knows which type they play, and most know both sets of rules

before we play a game we agree upon which rules we use

both types are still called klaverjassen though :)

(my gf also learned scrabble in a different way, she has a different boardgame called 'boardscript' which has a few different rules, but its still mainly scrabble, we play that game most of the time now.)

the scrabbles have different names and different rules

the klaverjassen types however have the same name, just different sets of rules which we agree upon (and we also did in college when played the game with people from either amsterdam or outside :))