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

Here is Why You Need An Adapter

The outlet and plug type used in Hong Kong is G 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

Hong Kong

In Hong Kong, outlets of type G are in use.

Type G