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

Here is Why You Need An Adapter

The outlet and plug type used in Hong Kong is G and in Mauritius are C and G. This is how they look like.

Mauritius

In Mauritius, outlets of type C and G are in use.

Type C

Type G

Hong Kong

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

Type G