Notwithstanding any limitation imposed on the powers of the Parliament of Northern Ireland by the Government of Ireland Act, 1920, that Parliament may, by any Act re-enacting (with or without modifications) or amending the law in force in Northern Ireland with respect to the custody and treatment of prisoners and other persons detained, make such amendments of the provisions of this Act, so far as those provisions extend to Northern Ireland, as may be necessary for the purpose of bringing those provisions into conformity with the provisions of that Act.