Whether deposited as eggs or dropped as fully formed miniature adults, snakes are on their own from the start. Snakes do not take any responsibility for the care and protection of their young. Most snakes mature at one or two years of age, and individuals may live up to twenty years in the wild. The greatest age known for any snake is just under 30 years, attained by both the anaconda and the black-lipped cobra. Effects of the bites of Black and Green Mamba - Black and green mambas both produce neurotoxins, which is why they kill so fast.
Black mamba is more venomous.
Neurotoxin inhibitors and antivenin are generally made from the venom of the same snake, but it is likely that antivenin from one would be at least partially effective against the other. Because these are two different snakes their venom has to be different and thus the antivenin from one may not act for the other.