In the U.S.A., the best equivalent to Durban Masala curry powder would be a "red curry powder" rather than the typical curry powder found on our supermarket shelves which tends to be yellow in color from the turmeric in it. In addition, a good dose of cayenne pepper fires things up.
Durban Curry was adopted by the British settlers and also the Zulu inhabitants, simplified and streamlined to become a staple enjoyed by all. It is the one dish that everyone regardless of skin color is passionate about.