Where there has been a change to the degree of the relevant degree of the disability of a worker receiving a disability compensation pension, and as a result of such change, the worker falls under another grade of disability prescribed in Appended Table 1 or Appended Table 2, the government is to, pursuant to the provisions of Order of the Ministry of Health, Labour and Welfare, pay the disability compensation pension or lump sum compensation payment for disability corresponding to the new grade of disability under which the worker now falls, and does not pay the former disability compensation pension thereafter.