The provisions of Article 161, item (viii), (b) (Domestic Source Income), Article 169, item (iii) (Income Tax Base for Separate Taxation), and Article 213, paragraph (1), item (i), (a) (Amount of Taxes Withheld from Domestic Source Income) of the new Act apply to pensions set forth in Article 161, item (viii), (b) of the new Act which are to be paid on or after the effective date, and the provisions then in force continue to govern public pensions or retirement packages prescribed in Article 161, item (viii), (b) (Domestic Source Income) of the former Act which are to be paid before the effective date.