You Do Need power plug adapter while traveling from Curaçao 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 Curaçao are A and B. This is how they look like.

Curaçao

In Curaçao, outlets of type A and B are in use.

Type A

Type B

South Africa

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

Type C

Type M

Type N