Both of these statements mean the same thing. They are metaphors emphasizing that God's servant will be gentle and kind. Both "bruised reed" and "smoking flax" represent weak and hurting people. If the metaphor is confusing, you could translate the literal meaning. Alternate translation: "He will be kind to weak people, and he will be gentle to those who are hurting"(See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-metaphor]])
Leading someone to victory represents causing him to be victorious. Causing justice to be victorious represents making things right that had been wrong. Alternate translation: "he makes everything right" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])