Durnford did indeed have both his arms although he had lost the use of one of them, and so tucked it into the front of his tunic. Our figure was sculpted to show this.
Not much more I can say on the subject really
As for the film I personally do not think that the two films can be compared. Both are good for different reasons although if I am honest I prefer Zulu. Worth noting is that the Boer wagon that gets turned over in Zulu was an original as were the cartridge boxes that are being opened in Zulu Dawn. Evidently the boxes were borrowed from a collection and trashed in good Hollywood style.
Paul