Sections 1051 and 1052 are applicable to applications for transfer of reserve accounts made after the 90-day period beginning with the date of acquisition but prior to the cancellation of the reserve account pursuant to Section 1029 if the reserve account has not been reacquired by the predecessor on re-entering business or, in the case of distinct and severable portions, if the predecessor did not continue in business, but any amendment of the contribution rate shall be made as of the first day of the calendar quarter next succeeding the date of the application.