Even if its set in an alternate timeline, i belive that the world/locations wouldn't change that much... So if Sims 4 is set in the same world as The Sims Medieval would be, the game seems to hint that the world is a swapped version of ours. The castles/kingdoms/old country would be in the west, instead of the east.
Here is the Ye Knowne Wyrlde map:
https://vignette.wikia.nocookie.net/thesimsmedieval/images/b/bf/Territory_Map.png/revision/latest?cb=20110408235103
I believe that Windenburg would be in this lands.
