These two phrases are similar in meaning. Either the princes of Zoan are also the wisest advisors or Pharaoh, or they are another group of people that also are shown to be foolish. (See: [[rc://en/ta/man/translate/figs-parallelism]])
Isaiah uses a question to mock those in Egypt who claim to be wise. AT: "You foolishly say to Pharaoh ... kings." (See: [[rc://en/ta/man/translate/figs-rquestion]])