most charts are just an array of color swatches & written references to their cmyk values... the thing is to print it on your printer & your media, under a specific set of specifications, which you should write on the chart. If you use Flexi, to print a chart on 3651, at high speed, bidirectional, 360-540... with a specified profile & heat settings etc... then any color on that chart can be replicated by using the same settings, and media.