You Do Need power plug adapter while traveling from Samoa 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 Samoa is I. This is how they look like.

Samoa

In Samoa, outlets of type I are in use.

Type I

Central African Republic

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

Type C

Type E