01-02 are not the same, no. The 01 is round and longer, the 02 is shorter and oval. Talking about the can, of course. My issue is not look but rather USFS-compliance. Since the exhaust ports are the frame are the same between 01 and 03, I guess as long as you use the entire line (header, mid pipe and muffler), they should be interchangeable, as you say.