England and France in 1154 are practically different nations with very different cultures compared to England and France in 2022, not to mention nine centuries'

England and France in 1154 are practically different nations with very different cultures compared to England and France in 2022, not to mention nine centuries' worth of evolving relations between those two. Any pattern can resemble each other when they are approximated on large enough scales because then all differences would be wiped out. Geopolitical boundaries do often survive in some forms throughout history, as we can see some resemblances of the divisions in Medieval France vs. modern French departments. However this is the product of mainly geographical divisions (terrain such as rivers, mountains, plateaus, etc.) and in Brittany's case, an ethnic culture historically unique relative to the rest of France.