NATMO was Rs.425/- to Rs.700/-, which was decidedly lower than the pay scale of Rs.550/- to Rs.900/-, i.e., the pay scale on which he was working as Senior Cartographic Assistant with SLSUI and, therefore, two posts could not be treated as equivalent. We find no reason to differ with this conclusion arrived at by the learned Tribunal. 6. Furthermore, we find that the petitioner had while in service, without any demur accepted the grant of benefits under the ACP Scheme in 1999 and 2006, which were granted by taking into account his service w.e.f., 05.07.1982, the date when he joined the SLSUI. The petitioner approached the learned Tribunal after almost 9 years, for which delay, there is absolutely no explanation. We are, therefore, of the considered view that an issue which had already attained finality in 1982 when the petitioner joined the service with SLUSI without seeking any benefits of his past service with NATMO, cannot be permitted to be re-agitated at this belated stage.