What you have there is a Corn Snake. There are a couple of things to look for/at.
The Corn Snake will have squarish block patterns running down its spine. The Copperhead will have interlocking diamond-like patterns running down its spine and sides. A feature that is quite different between the two are their heads. The Corn Snake will have a narrow long head while the Copperhead will have a wider, shorter shovel shaped head similar to other poisonous snakes (and some non-poisonous water snakes).
If you get really close you will notice that the Copperhead will have "pits" slightly below the midpoint of a line drawn between the snake's eyes and nostrils.
The picture linked below shows a Corn Snake with two young Copperheads. When the snakes are next to each other the differences are more apparent.
https://wading-in.net/walkabout/wp-content/uploads/2011/10/TellingThemApart.jpg
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