The Chairman and members of the Commission shall have the same rank, receive an annual salary equivalent to, and be entitled to the same allowances, retirement and benefits as those of the Presiding Justice and Associate Justices of the Court of Appeals, respectively. Labor Arbiters shall have the same rank, receive an annual salary equivalent to and be entitled to the same allowances, retirement and other benefits and privileges as those of the judges of the Regional Trial Courts. In no case, however, shall the provision of this Article result in the diminution of the existing salaries, allowances and benefits of the aforementioned officials.