Hi There,
I'm also a self confessed fan of two-tone cars. Although that sample car you showed should have the hubcaps matched to the roof - which looks better IMHO.
I'm also restoring a car in 542G colour ("Dark Red"). One thing I noticed about some/many colours is how different they look in different light, on horizontal surfaces or vertical surfaces, etc, etc.
I find the 542G does look Brown at times and Burgundy other times. My guy doing the painting had different people mix up samples (for comparison) and he thought each sample looked different, but I was not so convinced as some samples he showed me were wet, others were dry, and they were on different substrates. It's not a very complicated colour as it is only made up of 3 tints. He eventually used the paint as it came out of his tinting machine and to me it looks fine - sometimes Burgundy and sometimes Brown. As long as he paints the entire car with the same paint tinting machine I am happy.
I've attached 2 photos of the dash that was recently painted - one using the flash, and one without.
Hope this helps in some way.
Cheers
Rob