Does an argument based on equal protection or due process need to be duplicated?

2 In this context, "an argument based on equal protection essentially duplicates an argument based on due process." Chapman v. United States, 111 S.Ct. 1919 (1991). As with his due process argument, to prove an equal protection violation Godinho must show that the Guidelines approach "is not rationally related to a legitimate government interest." United States v. Litteral, 910 F.2d 547, 552 (9th Cir.1990); United States v. Klein, 860 F.2d 1489, 1500 (9th Cir.1988) ("[s]ince a suspect classification is not implicated, we only need to identify a rational basis").