How does the shared ethnicity of royal families in the west compare to royal families in the far east?

If you were to take a look at the modern and ancient lineages of royalty in Europe you would find that there is a wide scale shared ethnicity in my opinion. Royals married royals.

With so many different cultures in the far east, were the same practices taking place there? Were royal families from each region in the far east mate sharing?

Or, is the common royalty in the far east more closely related to other royal families in other cultures, or there own sub culture?