(4)A procurement may not be made from a source on the basis of a preference provided in paragraph (2) or (3), if the procurement would otherwise be made from a different source under section 4124 or 4125 of title 18 or chapter 85 of title 41.
(e)A procurement may not be made from a source on the basis of a preference provided under subsection (a) or (b) if the procurement would otherwise be made from a different source under section 4124 or 4125 of title 18 or chapter 85 of title 41.