You'll never be able to do it.
Colour depends on the surface it is applied to. And the lighting you view it with. This applies to paint, ink and basically anything that needs to dry.
If you are painting onto wallpaper you'll get a different colour depending on how pourous the paper is. You'll also get a different colour if you are applying to plaster.
Equally, if you view a colour in a room which lets in little natural light you'll get a different effect to one with lots of natural light. And artificial light varies depending on the type and brightness of the bulbs you use.
Then there's atmospheric differences. You'd be amazed at the difference temperature and the moisture in the air can make.
And then again, all these sample charts are done on a paper which is completely different to the surface they will actually used on.
Despite standardised colours within printing to minimise problems like this, even professional printers are subject to a certain level of variance, which is visible to human eyes.
Put simply, there is a limit to the accuracy that paint manufacturers can produce to represent a colour on a tin or a chart. Its impossible. So I'm afraid YABU.