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

Here is Why You Need An Adapter

The outlet and plug type used in Ghana are D and 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

Ghana

In Ghana, outlets of type D and G are in use.

Type D

Type G