King Hill project, Idaho, shall be subject to the reclamation Act of June seventeenth, nineteen hundred and two, and all Acts amendatory thereof or supplementary thereto, so far as applicable and consistent with contract made prior to July 1, 1918, between the United States and King Hill irrigation district: Provided, That for the purposes of issuing patent to lands reclaimed, the reclamation effected by the operations of the United States Reclamation Service may be considered by the Secretary of the Interior as equivalent to reclamation effected by the State of Idaho, under section 641 of this title.