These pictures are all of prototype and pre production test cars. Of course the paint isn't going to match.
And the "rope" off the decklid is most likely there for a safety thing I would likely say.
I used to be a test driver, driving prototype Hellcats, Dodge Darts, Jeep Renegades, Cherokee's,Durango's Charger's..etc, back in 2013.
All those vehicles had mismatched paint, some had NO paint, different panels, interior pieces and so on. They were all PROTOTYPE mules!
Engineering working all the bugs out, while making adjustments and improvements along the way.