All of the provisions of subpart B, part 203 of this chapter covering mortgages insured under section 203 of the National Housing Act apply to mortgages covering one- to four-family dwellings insured under section 221 of the National Housing Act, except the following provisions:
For the purposes of this subpart, all references in part 203 of this chapter to section 203 of the Act shall be construed to refer to section 221 of the Act, and all references to the Mutual Mortgage Insurance Fund shall be construed to refer to the General Insurance Fund.