Notwithstanding the provisions of §§ 14-86-1401 — 14-86-1405, and any other provision relating to giving notice prior to selling or filing suit for sale of lands for nonpayment of improvement district assessments, the provisions of subchapter 3 of this chapter shall be the only notice requirement applicable to any improvement district embracing lands in four (4) or more counties for selling or filing suit to sell any lands for nonpayment of improvement district assessments.