You Do Need power plug adapter while traveling from Afghanistan 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 Afghanistan are C and F. This is how they look like.

Afghanistan

In Afghanistan, outlets of type C and F are in use.

Type C

Type F

South Africa

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

Type C

Type M

Type N