One of the most important differences was the role of the monarch. In Britain, the monarch was the head of state and the head of government. This meant that the monarch had the power to make laws, to declare war, and to sign treaties. In France, on the other hand, the monarch was the head of state, but not the head of government. This meant that the monarch had limited power and that the real power was held by the First Minister.
Another important difference between the British and French monarchies was the way in which the monarch was chosen. In Britain, the monarch is hereditary, which means that the throne passes from parent to child. In France, on the other hand, the monarch was elected by a group of nobles.
Finally, the British monarchy and the French monarchy had different attitudes towards religion. In Britain, the monarch was the head of the Church of England, and the Church of England was the official religion of the state. In France, on the other hand, there was no official religion, and the French monarchy was tolerant of all religions.
Overall, the British monarchy and the French monarchy were two very different systems of government. The British monarchy was more powerful, more hereditary, and more religious than the French monarchy.