Bhutan → Brunei
Bhutan plugs
Type C
Type D
Type MBrunei plugs
Type GNo shared plug types. A travel adapter is required.
Compatibility: Adapter Required
Voltage — Bhutan 230V — Brunei 240V
Voltage difference is small. Most electronics will work safely.
Device compatibility (phones)
Phones almost always support 100–240V, so yours should work safely. Check your charger label to confirm.
You likely only need a plug adapter (if socket shapes differ). Voltage is close between these countries.