448. A person to whom the Commission pays an income replacement indemnity or a total disability benefit under an Act administered by it and who, by reason of a new event, claims such indemnity or benefit under the Automobile Insurance Act (chapter A-25) or an Act administered by the Commission other than that under which he is already receiving the indemnity or benefit, is not entitled to both one and the other indemnity for the same period. The Commission shall continue to pay to the person the income replacement indemnity or the total disability benefit that he is already receiving, where required, while awaiting the determination of the entitlement to and the amount of benefits payable under each of the applicable Acts.