What was common and what was different in England and France in medieval times?

Similarity

In the Middle Ages, these two kingdoms were quite closely related, with each other and had close blood and dynastic ties.

There was a particular similarity during the decline of the feudal system, when power began to acquire not monarchs and kings, but representatives of estates.

Differences

The first major difference is the state system and its governance. France had a peerage where the estate representatives had great power.

But in England, the structure was under which Wales had a kind of vassal oath, but he had to be a part of England, but it retained its legal possibilities.