Compatibility summary
You will need a travel adapter in Nicaragua; plug types used there differ from South Africa. Voltage differs by more than 20% — a voltage converter may be needed for some appliances.
Plug comparison
South Africa plug types: C D M N
Nicaragua plug types: A B
There is no common plug type between South Africa (C D M N) and Nicaragua (A B). You need a travel adapter.
Voltage comparison
South Africa: 230V, 50Hz
Nicaragua: 120V, 60Hz
Voltage converter recommended (South Africa 230V vs Nicaragua 120V).