The provisions of this Act or the Schemes made thereunder shall have effect notwithstanding anything inconsistent therewith contained in any other law for the time being in force or in any instrument having effect by virtue of such law:
     Provided that where a State enactment exists or is enacted to provide employment guarantee for unskilled manual work to rural households consistent with the provisions of this Act under which the entitlement of the households is not less than and the conditions of employment are not inferior to what is guaranteed under this Act, the State Government shall have the option of implementing its own enactment:
     Provided further that in such cases the financial assistance shall be paid to the concerned State Government in such manner as shall be determined by the Central Government, which shall not exceed what the State would have been entitled to receive under this Act had a Scheme made under this Act had to be implemented.