Another interesting thing to note is Kassites and Hurrians most likely came in contact with different Vedic tribes.
Kassite Vedic God list:
Bhaga(Bugash), Marruta, Suriash(Suriya)
Mitanni Vedic God list:
Varuna, Nassitiya, Mitra
Indra being common to both.
I wouldn't be surprised if once...