I haven't had a chance to work with the side by side photos I got last night under fluorescent light.
As I mentioned earleir, the biggest thing is the fact that the Centralia cars are a satin finish and the Kato cars are much glossier so the colors appear deeper. The orange is different but not wildly so (Kato's is brighter." I have no reservations running them mixed. Color is subjective and someone else might say "Ugh!"
Real cars weather differently from each other so I don't think these are in the "OMG that's horrid" area at all. That said, I think the Kato cars could benefit from some dulling/weatherig of the roof at least which will make both work better together.