They're all 744's with flat J seats. Don't know for sure if they're 38- or 70-seat variants, but suspect the former.

BTW, be warned that catering ex-India leaves a lot to be desired. I flew LHR/MAA return in March and, although food was fab for the outbound, it was dire for the return. My travelling companion fared even worse, having ordered a diabetic meal - it looked, and apparently was, tasteless. The crew apologised profusely and told us it was bad out of all the Indian airports.