You Do Need power plug adapter while traveling from Central African Republic to Congo.

Here is Why You Need An Adapter

The outlet and plug type used in Congo are C, D and E and in Central African Republic are C and E. This is how they look like.

Central African Republic

In Central African Republic, outlets of type C and E are in use.

Type C

Type E

Congo

In Congo, outlets of type C, D and E are in use.

Type C

Type D

Type E