2-tone buckets are fairly common - darker (or lighter) insert, as seen on a lot of Aqua's, etc. Never seen it on a Parchment interior, though. I think the owner just used black armrests - not (AFAIK) a factory option.
Nor have I seen (on this site, at least) a 2-tone painted CS. Although I haven't done an exhaustive search - just poked around in galleries.
Regardless, I don't think it'll be settled until we see a Marti, or at least a picture of the complete door tag.
I should say, though, that I think this is a good-looking CS - if I didn't have one already, I might fly into Reno to look at this one - love the color, and I even like the wheel/tire combo.