Saying that both are murder makes one of them not matter? How?
If I were to say, “killing a 24-year-old man is murder, but killing a 67-year-old woman isn’t because that life is worth less,” that would be ludicrous. Both are murder. It doesn’t matter which one was the more morally wrong when you’re deciding what defining term to attach to it. All are examples of murder, they just are under different circumstances and have different affects.