That's probably not CPB. They are a lot more destructive than what those leaves look like, and you should see larvae or eggs under the leaves if it is them. It probably is a more minor pest like tortoise beetles.
It also probably isn't anything to worry about unless the plants are being consumed at a high percentage. Most people worry about catching and destroying every last little pest, without realizing that potato plants can often lose 30-40% of their foliage with about zero loss of yield.
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