Maybe you guys already know, but I learned that the Primer color will make a difference in the appearance of the Top Coat color. FWIW, I was using Rustoleum Sunrise Red over Duplicolor PR4 which may make a difference.
In my case though I was using the same primer for each fender. Once the color was on one side was damn near a perfect match, the other looked more like a cherry red like @rasband , though a smidgen darker. I've just never had a quality spray or match with duplicolor. And I've gone thru a ton of their spray cans