Answer:
The Feudal System in Europe created a social structure in which several local lords (the Feudal lords) ruled over relatively small geographical areas. In formal terms, these Feudal Lords were bound to the monarch, but in practice, they wielded more power than the monarch over their fiefs. This social system was justified under a combination of religious scripture and ancient customs.
The Mandate of Heaven, on the other hand, gave divine legitimacy and justification to the central authority in China: the Emperor, a dictatorial figure more like the absolute monarchs of Europe during the European era than the medieval monarchs. This mandate stated that the Emperor had the right to rule over an united China because he was the representative of Heaven on Earth.