Those are cottonmouths. The difference isn't always easy to tell if you aren't looking in the right spot. The biggest giveaway for a cottonmouth is the dark stripe along/across the eye that copperheads lack. Copperheads also tend to have less "noise" in their banding, so at least in my area (TX) our copperheads would not have any of the extra spot markings.
Copperheads tend to be brighter with lighter background coloring than this also, less of a brown snake. Some areas, like where I am, they're quite vivid in the red/copper coloring.
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