Copperheads have a wide arrow shaped head because they are venomous, this doesn’t. Pretty much the only venomous exception to that rule is a coral snake in North America.
Oh and brown water snakes have a wide head, but no venom. They seem like a laidback snake I stepped on or next to 13 that I know of (fishing daily over a few years and the place was swampy and packed with them) and not one struck at me they just went in the water. Stepping on a snake in flip flops while watching a lure instead of your feet is a bad feeling, saw plenty of moccasins out there too but luckily only had run ins with brown water snakes.
Saw a black and white mottled looking king snake same time period...struck at me walking by and played dead lol