Compatibility summary
Your Philippines plug may fit in Thailand outlets, as both use at least one common plug type.
Plug comparison
Philippines plug types: A B C
Thailand plug types: A B C O
Both countries share at least one plug type (A B C and A B C O), so some plugs may work without an adapter. Check your appliance.
Voltage comparison
Philippines: 220V, 60Hz
Thailand: 220V, 50Hz
Voltage difference is within a range many devices tolerate; check your appliance label.