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Your question doesn't make sense, are you mixing and matching your own paint at home? That's entirely unpractical, please don't take this the wrong way but why would you do this?
You won't get the answer, I can tell you that. Colors and proportions to mixing paint are all manufacturer specific and apply to tints used to mix in with a base, tints that aren't generally available to the average DIY'er. So even if you had the mixing info, it wouldn't help. Anything else is guesswork, just as if you were mixing craft paints for a different color.
How about if you find a piece of sculpture, fabric, food, or some THING in a color you like? Take it to the paint store, get them to mix up the paint to match it. They have a computer program that looks at it.
I did that - took in a piece of pottery I had made, they showed me the paint chip. I went one shade lighter; in restrospect I should have gone two shades lighter. Then I put it on the wall. Or go to the paint store, get bunches of paint chip strips that you think you like and take them home. Tack them on the wall that you think you'll use them on. The other colors in the room will reflect on the new colors, your lights will be different than the store. There are about a jillion variables.
Charleston Green is just a name - it's not a recipe. Every manufacturer just makes up names. The employees have the formula for mixing the one you like. And if you get it mixed right one time - you will probably never get it mixed the same way again. Too risky for me. The pros mix all the gallons of a color in one big bucket so that the color will really and truely be uniform. And sun will fade a custom color differently than one that's a stock color.
Supposedly, TrueValue has a paint color called "Charleston Green". Just found this info today...haven't had time to check it out. My local DoItBest hardware store owner checked it out. He got the formula from DoItBest. I will find the paint chip this week at TrueValue. If it looks good, I'm going to have him mix it and use it on our shutters and swing. If you are interested, I'll get the formula also.