I must admit my Defender didn't have a paint code on it anywhere that I could see. I did however manage to identify the code thru' the website.
JUH Arles, Windjammer, Pacific Blue 90-97 LRC.424
I suppose if you ask at a Land Rover Dealership, quoting your chassis no. they may be able to tell you what the original paint colour/code was when you vehicle left the factory.