Yeah, it's true, those old codes don't mean anything anymore. If you have anything with the color already on it, the auto paint store can put a camera on it and try and come up with something, or just eye it up as close as possible.
They were able to match my 350 Gentle Maroon Metallic to a 2004 VW color, some kind of Cranberry something or other; then just added some metallic flake.
Once you do get something mixed, just make sure you keep that code somewhere safe for the future.