B5 BLUE

Yes, they still make B5 blue,(edit: they still use the code B5) or at least they did a couple years ago. When I bought my 71 demon the previous owner painted the engine compartment in like a 2018 or so B5 and it WAS 38-1/2 shades off of the 71 B5!

That said, air pressure at the cap, distance of the gun from the surface, speed of the gun moved across the surface, angle of the nozzle to the surface, will all affect the final color. It has to do with the metallic laydown. If the particles lay flat, they reflect light like a mirror and the color will be lighter. If you lay them down and they are on their sides, it will be darker. This can be seen as flip flop between panels or even stripes. It is most notable under street lights (i think the orange hued mercury vapor lights are the worse for this but I may be wrong). Color blending on a panel can be tricky and often comes down to technique but you would be surprised of the different color hues you can get with technique.