Feeding multiple snakes in a cage or when they have remnants of prey scent in the cage or worse yet on their "person" is a recipe for disaster regardless of species... I know of a Dumeril's boa that killed it's cage mate in such a circumstance. So far as the Mamba goes it is anecdotal evidence at best, since necrosis may have been present and systemically poisoning the patient with bacterial by-products rather than the venomous animal's venom. Whether or not mamba's are immune to mamba venom has not been proved or disproved by this case. One could argue that since mamba's are not thought to be prey items to each other immunity would not be neccesitated. Again anecdotally I had the misfortune some years ago of having a juvinile Western Diamondback rattlesnake bite it's sibling on the head during the night... no food present.... and the bite recipient died the next day. Whether this was due to invenomation or mechanical injury to the snake could/can not be determined.

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