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

Here is Why You Need An Adapter

The outlet and plug type used in Guyana are A, B, D and G and in South Africa are C, M and N. This is how they look like.

South Africa

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

Type C

Type M

Type N

Guyana

In Guyana, outlets of type A, B, D and G are in use.

Type A

Type B

Type D

Type G