You Do Need power plug adapter while traveling from Hong Kong 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 Hong Kong is G. This is how they look like.

Hong Kong

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

Type G

Western Sahara

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

Type C

Type E