Funds under this Act (other than those made available for section 7784(f) of this title) are intended to supplement, not replace, assistance available to weed management entities, areas, and districts for control or eradication of noxious weeds on Federal lands and non-Federal lands. The provision of funds to a weed management entity under this Act (other than those made available for section 7784(f) of this title) shall have no effect on the amount of any payment received by a county from the Federal Government under chapter 69 of title 31.