Here's a good link that shows how
red from a manufacturer's viewpoint (in this case, Lamborghini) can take on several hues.
Notice
Red Mic 3TC (PPG #224147) about 15 paint chips down. It's much deeper and more vibrant than Diablo Rossa 2CT just below it. Diablo Rossa almost looks orange in comparison.
http://www.lambocars.com/paint.htm