You Do Need power plug adapter while traveling from Mayotte to South Africa.

Here is Why You Need An Adapter

The outlet and plug type used in South Africa are C, M and N and in Mayotte are C and E. This is how they look like.

Mayotte

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

Type C

Type E

South Africa

In South Africa, outlets of type C, M and N are in use.

Type C

Type M

Type N