MUTUAL TRANSFER AFTER PROMOTION JE TO SSE

MY INITIAL POSTING WAS JE BUT PRESENTY I AM WORKING AS A SSE AND I WANT MUTUAL TRANSFER TO CANDIDATE WHOSE INITIAL POSTING WAS ALSO JE AND RIGHT NOW HE IS WORKING AS SSE.IF MUTUAL IS POSSIBLE THEN WHAT WILL BE THE DEGISNATION AFTER MUTUAL TRANSFER.MY COMM. IS OBE AND OTHER PARTY COMMUNITY IS ST.BOTH ARE RRB CANDIDATE.