Tim, I suspect there are few, if more than one, source for these. In production printing, color variations can occur from lot to lot in ink and vinyl but are most likely a result of the printing process itself.
If you ordered from a different dealer or even from the same one, you could see a variation in the colors.
I have found Diane at Gas Pump Heaven to be extremely helpful with issues like this. Many times she has gone "above and beyond" to assist me. Give her a call, I'm sure she will be happy to spread out several and discuss the colors with you.
Good Luck