66. Other provisions relating to Services.-
(1) Nothing in this section or sections 62 to 65 (both inclusive) shall be deemed to affect on or after the appointed day the operation of the provisions of Chapter I of Part XIV of the Constitution in relation to determination of conditions of service of persons serving in connection with the affairs of the State of Manipur, Meghalaya or Tripura or the Union territory of Mizoram:
Provided that the conditions of service applicable immediately before the appointed day in the case of any person deemed to have been allocated to the State of Manipur or the State of Tripura under section 62 or to the State of Meghalaya under sub-section (1) of section 64 or section 65 or to the Union under sub-section (2) of section 64 shall not be varied to his disadvantage except with the previous approval of the Central Government.
(2) All services prior to the appointed day rendered by a person-
(a) if he is deemed to have been allocated to any State under section 62 or section 64 or section 65, shall be deemed to have been rendered in connection with the affairs of that State,
(b) if he is deemed to have been allocated to the Union in connection with the administration of the Union territory of Mizoram, shall be deemed to have been rendered in connection with the affairs of the Union,
for the purposes of the rules regulating his conditions of service.
(3) The provisions of sections 62, 64 and 65 shall not apply in relation to members of any All-India Service.