When the same borrower and the same lender make a substitution loan on the same property, the title to which was insured by an insurer in connection with the original loan.

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At the time a substitution loan is made, the unpaid principal balance of the previous loan will be considered the amount of insurance in the force on which the foregoing rates shall be calculated. To these rates shall be added the regular rates in the applicable schedules for any new insurance, that is, the difference between the unpaid principal balance of the original loan and the amount of the new loan.