services to individual Indians shall be available under a funding agreement only to the extent that the same services that would have been provided by the Secretary are provided to individual Indians by the Indian Tribe. (f) Multiyear funding A funding agreement may provide for multiyear funding. (g) Limitations on authority of the Secretary The Secretary shall not— (1) fail to transfer to an Indian Tribe its full share of any central, headquarters, regional, area, or service unit office or other funds due under this title for programs eligible under paragraph (1) or (2) of section 403(b), except as required by Federal law