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

Here is Why You Need An Adapter

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

Guinea

In Guinea, outlets of type C, F and K are in use.

Type C

Type F

Type K

Central African Republic

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

Type C

Type E