General assistance payments made by the Bureau of Indian Affairs shall be made—

(1) after April 29, 1985, and before October 1, 1995, on the basis of Aid to Families with Dependent Children (AFDC) standards of need; and

(2) on and after October 1, 1995, on the basis of standards of need established under the State program funded under part A of title IV of the Social Security Act [42 U.S.C. 601 et seq.],

except that where a State ratably reduces its AFDC or State program payments, the Bureau shall reduce general assistance payments in such State by the same percentage as the State has reduced the AFDC or State program payment.