Pub. L. 94–455, title XX, § 2008(d)(1), “(A) insofar as they relate to the tax imposed under chapter 11 of the Internal Revenue Code of 1986 [formerly I.R.C. 1954, section 2001 et seq. of this title], shall apply to the estates of decedents dying after “(B) insofar as they relate to the tax imposed under chapter 12 of such Code [section 2501 et seq. of this title], shall apply to gifts made after