I think mine was actually an earlier run, as the underframe and trucks still say "Kadee", but I can't promise they haven't been switched. It also doesn't have end reporting marks, another sign that's it's probably older than yours.
Mine has a larger road name, and no Plate C label, yellow door stripe, or "CAR-PAC" label. It's odd that they would take what was a plausible, if likely freelanced, car, and make an obvious fake from it. But, as you said, yours is a good looking model.
ExactRail made the Gunderson car in SP&S, but I missed out on it, and t doesn't look like they'll ever be rerun. So, I bought one of their MP cars on sale, stripped and repainted it, and am working on the decals.