Where there has been a change in the degree of the relevant degree of disability of a worker receiving an illness or injury compensation pension, and as a result of such change, that person falls under another grade of illness or injury prescribed in appended table 1, the government, pursuant to the provisions of Order of the Ministry of Health, Labour and Welfare, pays the illness or injury compensation pension corresponding to the new grade of illness or injury under which the person now falls, and does not pay the former illness or injury compensation pension thereafter.