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

Here is Why You Need An Adapter

The outlet and plug type used in Cuba are A, B, C and L and in Western Sahara are C and E. This is how they look like.

Western Sahara

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

Type C

Type E

Cuba

In Cuba, outlets of type A, B, C and L are in use.

Type A

Type B

Type C

Type L