India is much more diverse, including at a genetic level. The Han Chinese are one people, whereas Indians are clustered in hundreds of populations of around 3 m

India is much more diverse, including at a genetic level. The Han Chinese are one people, whereas Indians are clustered in hundreds of populations of around 3 million that have managed a higher level of endogamy than Ashkenazi Jews for over 3 millennia: Source: chapter 6 of "Who We Are And How We Got Here" by David Reich.