Both of these statements mean the same thing. They emphasize that Balak wants Balaam to curse the people of Israel. (See: [[rc://en/ta/man/translate/figs-parallelism]])
These rhetorical questions emphasize Balaam's refusal to disobey God. They can be translated as statements. AT: "But I cannot curse those whom God has not cursed. I cannot fight against those whom Yahweh does not fight!" (See: [[rc://en/ta/man/translate/figs-rquestion]])