The sums appropriated by Section 18003 shall be considered for all purposes to be “federal assistance” and “grants-in-aid” from the United States government for aid to families with dependent children, aid to the aged, aid to the blind, and aid to the disabled, respectively, and shall not be considered to be state moneys or appropriations from the State Treasury. All such sums shall be subject to all of the provisions applicable to funds received by this state from the United States government, and all of the provisions of the chapters governing public assistance programs shall be construed and applied in every respect as if such funds had been in fact received by this state from the United States government. However, none of such sums shall be considered for any purpose to be federal assistance or grants for the cost of administering joint public assistance.