You Do Need power plug adapter while traveling from Costa Rica 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 Costa Rica are A and B. This is how they look like.

Costa Rica

In Costa Rica, outlets of type A and B are in use.

Type A

Type B

Central African Republic

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

Type C

Type E