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The shape is so distinctive that you can easily recognise these snakes from a distance. And some harmless species like the grass snake, smooth snake and viperine snake use that to their advantage. When threatened, they flatten their narrow heads into a triangle, mimicking the shape of their more dangerous cousins.

this shows that this is not the only  snake that copy's other snakes  to make them look dangerous

https://www.nationalgeographic.com/science/phenomena/2011/08/01/harmless-snakes-avoid-danger-by-mimicking-the-triangular-heads-of-vipers/

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Other reason is that they all live in similar areas to each other and biomes

This supports my claim because since they all live in parts of the grass lands they will most likely have similar predators so they will know not to eat them because they think there toxic

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Sometimes in nature a dangerous, or venomous animal will develop a bright color pattern that tells other animals, "stay away"! Then sometimes other animals that aren't dangerous will evolve a similar color pattern that copies the dangerous animal - this is called Batesian Mimicry.

This supports my claim by saying that  this kind thing can happen among many animals including snakes and frogs

http://www.wildlife-removal.com/snakelookalike.html

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I think they look alike because  they  develop  patterns to look like the coral snake to scare predators

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Why do the Sonoran coral snake, Sonoran mountain kingsnake, the milk snake, and the Sonoran shovel-nosed snake look so similar?