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

Here is Why You Need An Adapter

The outlet and plug type used in Switzerland are C and J 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

Switzerland

In Switzerland, outlets of type C and J are in use.

Type C

Type J