The factory used Electrostatic guns, and I suspect that caused a lot of issues regarding colors and the way they shift etc.
A sure sign that somethings different is how the paint lays on the firewall where it joins the trans tunnel. A spray gun tends to have a larger overspray pattern there.

I heard once that reversing the polarity on a metallic will change the lay of the flakes for an imperceptible changes that makes color matching and behavior hard to duplicate. Does anyone have any insight or experience?