In any case in which a grant (including a supplementary grant described in section 3145 of this title) has been made by the Secretary under this subchapter (or made under this chapter, as in effect on the day before the effective date of the Economic Development Administration Reform Act of 1998) for a project, and, after the grant has been made but before completion of the project, the purpose or scope of the project that was the basis of the grant is modified, the Secretary may approve, subject (except for a grant for which funds were obligated in fiscal year 1995) to the availability of appropriations, the use of grant funds for the modified project if the Secretary determines that—