The employers bounded to a better end of service benefits regulations shall bear the excess value between the sums due thereby for such regulations, and the contributory end of service benefit in accordance with the provisions hereof, as well as for the benefit payable due to the difference between the maximum salary for the subscription of the private sector in such insurance and the benefit calculation salary in their regulations, should it be higher. Such excess or difference shall be calculated for the entire service period of the insured therefor, whether such period include service periods that precede or follow the subscription in the Committee. Such sums shall be paid in full within one month from the termination of the service of the insured to the Committee, who shall in turn pay them to the insured or the beneficiaries thereof upon the termination of the service.