Just to put some numbers into perspective. China and Europe have roughly the same amount of land, and Europe has a population of 744m (vs your est of <800m for China). So like idk how that would make sense for them to be the same range of population when China seems way more overcrowded.

> So like idk how that would make sense for them to be the same range of population when China seems way more overcrowded.

Different population distributions. In particular, the population of China is concentrated in the eastern half of the country, with very few people living in the western half. Contrast to Europe, which from what I understand is more evenly spread out.