Both questions mean basically the same thing. Eliphaz uses questions to emphasize that a person's actions and wisdom do not benefit God. AT: "A man cannot be useful to God. A wise man cannot be useful to him." (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-rquestion]])
Both of these statements mean the same thing. Eliphaz uses questions to emphasize that Job's actions do not help God. AT: "The Almighty does not receive any pleasure if you are righteous. He does not gain anything if you make your ways blameless." (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-rquestion]])