The regions are stored in T005S table - look it up and you will know what values you have in both systems.
You can anyway not know if those where the regions given by SAP or if the client changed or added them himself.
From experience in multiple rollouts in APAC region, we always had to add records to the region table. Sometimes the entries made by SAP where different depending when you bought that system e.g. and old 3.1 system which was upgraded to a ECC4 system may have different entries than a system that was directly bought as ECC4.
These are the regions from a old system that was decommissioned as it was on ECC4:
| MY | JOH | Johor | ||
| MY | KED | Kedah | ||
| MY | KEL | Kelantan | ||
| MY | KUL | Kuala Lumpur | ||
| MY | LAB | Labuan | ||
| MY | MEL | Melaka | ||
| MY | PAH | Pahang | ||
| MY | PEL | Perlis | ||
| MY | PER | Perak | ||
| MY | PIN | Pulau Pinang | ||
| MY | SAB | Sabah | ||
| MY | SAR | Sarawak | ||
| MY | SEL | Selangor | ||
| MY | SER | Negeri Sembilan | ||
| MY | TRE | Trengganu |