(a) In any case where an employer changes insurance carriers or where the employer having been self-insured, becomes insured or, having been insured, is approved to be self-insured, and the only dispute in a claim against that employer is the proper source of payment of benefits, the Workers' Compensation Commission shall direct that the appropriate compensation benefits be paid on an equal basis by the carriers or self-insured employer.
(b) Upon eventual resolution of the issue, the prevailing respondent shall be entitled to reimbursement from the other respondent of all moneys paid together with interest at the legal rate from the date of payment.