You Do Need power plug adapter while traveling from Hong Kong to Central African Republic.

Here is Why You Need An Adapter

The outlet and plug type used in Central African Republic 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

Central African Republic

In Central African Republic, outlets of type C and E are in use.

Type C

Type E