United States v. Iniguez-Barba, ___ F.3d ___, 485 F.3d 790 (5th Cir. April 25, 2007) (per curiam) ("While we don't look only to the label of the statute at issue to determine what exactly it proscribes, see Fierro-Reyna, 466 F.3d at 326-27, of course we must look to the labels of the statutes to which we compare the statute at issue.")