For the reserved categories, there are two lists of castes - one issued by the State govt and the other issued by the Central govt.

In many cases, there are castes that are recognized as OBC by the relevant State govt but not by the Central govt. Thus, such castes would be in the relevant Stae govt list not in the Central govt's list.

For OBC reservation in Central govt institutes such as the IITs, NITs, IIITs (except IIITH) and CFTIs, the relevant caste should be mentioned in the Central govt's list and the cert should be issued by the relevant Central govt authority.

So if it is centrally approved then it shall be approved.

Good Luck!