The certificate is considered to be valid only if it is issued under central OBC list which is decided by the central government for OBC NCL.
The OBC c ertificate issued by the state government will only be valid in the state only because you come under state OBC list. Every state has a different caste falling under OBC list.
Hope this helps you
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile