Is There any Difference Between Bihari OBCs Upper Caste and Jharkhand Native Upper Caste and OBCs(Except Kurmi)?

Is there any cultural difference between Upper Caste and OBCs(Yadavs)of Bihar and Jharkhand Native Upper Caste and OBCs(Except Kurmi)?Do Upper Caste and OBCs Speak Santhali?Are Native Upper Caste and Yadavs of Bokaro,Dhanbad,Dumka,Giridih have Same Culture as of Bihar or Different?. Please Tell.