You Do Need power plug adapter while traveling from Cape Verde to Western Sahara.

Here is Why You Need An Adapter

The outlet and plug type used in Western Sahara are C and E and in Cape Verde are C and F. This is how they look like.

Cape Verde

In Cape Verde, outlets of type C and F are in use.

Type C

Type F

Western Sahara

In Western Sahara, outlets of type C and E are in use.

Type C

Type E