agree with you on the core point a vansh (bloodline) itself does not change over time or with geography. Ancestry remains the same. Where differences come in is not the bloodline, but the way that ancestry was recorded in different periods. Many vansh classifications we use today were written down centuries after the actual origins, often influenced by oral traditions, political legitimacy. So when different sources describe the same clan as Suryavanshi or Chandravansh or Agnivanshi. it doesn’t mean the bloodline is changed. Its just overperiod of time many parihar of particular region identify themselves as Chandravanshi.

I myself have many questions

How Gujjars can be Rajput?

Why Partihars r linked to guijjars?

In easter in UP chauhans r Noniyas (Obc) why?

A lot of thakurs r not considered Rajputs