I have compared complete BG plain mold-type productions against their color charts and actual backup shop samples of colors and found (for example) as many as two additional color/shades in a 12 scheduled runs and it was explained to me there were only 12 colors in each of the three productions in a period of time between 8-24 months which, different productions of any given number can vary slightly in composition mixture and probably even other factors.

Not too sure if slightly different color shades should be included, wherever, especially if manufacturer numbers of colors exist. Otherwise, we could be listing several shades of any color and, in the case with ChipGuide, we should take every precautions in keeping it perfectly accurate.