You Do Need power plug adapter while traveling from Samoa to Côte d'Ivoire (Ivory Coast).

Here is Why You Need An Adapter

The outlet and plug type used in Côte d'Ivoire (Ivory Coast) 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

Côte d'Ivoire (Ivory Coast)

In Côte d'Ivoire (Ivory Coast), outlets of type C and E are in use.

Type C

Type E