Compatibility summary
Your India plug may fit in Thailand outlets, as both use at least one common plug type.
Plug comparison
India plug types: C D M
Thailand plug types: A B C O
Both countries share at least one plug type (C D M and A B C O), so some plugs may work without an adapter. Check your appliance.
Voltage comparison
India: 230V, 50Hz
Thailand: 220V, 50Hz
Voltage difference is within a range many devices tolerate; check your appliance label.