These two phrases mean the same thing. Here "Jacob" and "Israel" represent the people of Israel. Yahweh is emphasizing that the people should not be afraid. AT: "people of Israel, my servants, do not be afraid" (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-metonymy]])
The abstract noun "destruction" can be stated using the verb "destroy." AT: "I will completely destroy all the nations" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])