The way the blend in is canny.
With the coral snake type, they can roll over and bite, a typical snake bite scenario, stepping on one.
Crotalidae are not anywhere as likely to or simply unable to bite like that, not that you'd want to find.
Here's a bit of odd rattlesnake lore.
The Eastern Diamondback featured on the Gadsden Don't Tread on Me flag can be up to a
10lb 8' long snake with 1.5" fangs, though typically less than 6', it's still the biggest venomous snake in North America, scary as all get out. This is an apex predator, a very important role, if they make it to adulthood. I'm confused as to the flag's use of the snake since it was routinely and ruthlessly hunted and killed - and eaten - in organized drives throughout the last few centuries, maybe still today, the flag itself from 1775.
I guess the flag basically says don't step on snakes, it's very good as a PSA, or is it standing up for the snake's right not to be stepped on as if we we were empathizing with snakes as victims of oppression because we oppress them?
Choose your favorite!
Key differences of timber rattlesnake vs eastern diamondback are their habitat and range, physical markings, size and behavior.
a-z-animals.com