Paradox has always used post-napoleonic province borders and names. There are numerous locations in Europe, that basically evolved. Just take modern bavaria, it is traditionally a mess in every pre-napoleonic Paradox game I have played so far. From wrong province borders (even if the border is marked by a river that is ingame over wrong capital locations, wrong capital names up to and including wrong government types, wrong names and so on.) Even the spelling of bavaria ("Bayern") is wrong, as it would be called "Baiern" as can be seen on every map up to Napoleon time frame. They have basically messed up everything just in that small region, including culture. And the only reason for that is their modern point of view.