Are snakes immune to their own venom?
It depends whether the two cobras were of the same species (there are many species of cobra). Most cobras have neurotoxic venom, but each species develops a slightly different version that may be more powerful or weaker or work in a slightly different way. If the cobra got bitten by a member of the same species, then it would not die from the venom in the other snakes bite, as in all species of venomous snakes, they are immune to their own venom, so that they do not poison themselves. They still might die from the puncture wound, or from this injury becoming infected. If a cobra bit a cobra of a different species, then the bitten cobra would be in trouble. It may be slightly more resistant to the venom than you or I, because it manufactures venom of the same type. However, depending on how potent the venom of the snake is, then it’s victim may well die, just as if one of us was bitten by its attacker.