A resolution is not a declaration of war. Legally, they have nothing in common. But that doesn't really matter. What matters is that by refusing to grant the prisoners POW status, Bush took them outside of US law. So, either they are POWs, or they are criminals. Those are the only 2 choices. And if they were POWs, they would still be granted trials if charged with specific crimes. By doing neither, and then not allowing them fair trials, Bush forfeited the right to keep them prisoner according to US law.