Bright Red Paint Code Differences

My '68 Dart 270 is getting ready for paint. Currently it is an enamel re-spray of PP1. Originally I was going to paint the car plum crazy purple, but the red has grown on me, really fits a '60s look better, etc. And I saw a nice '68 Charger in the spring only 33-1 bright red when I was at Carlisle, and I really liked the color.

So, is 33-1 bright red different from R4 bright red? I think they are supposed to be the same, but are they really? How about E5 bright red?

I want a red that is definitely more red than orange, but still almost flourescent red on an overcast day. The car I saw in 33-1 bright red looked like that to me. Any opinions?

What about Viper red? How does that compare to 33-1, R4 or E5?

I've included a poll for everyone to vote for their favorite red.