Color Values Tool

The correct way to do this is to use Lab values.  Thoose are universal and hooow color spaces for  RGB,CMYK and Hex are derived.  As DFosse suggests the RGB and CMYK color spaces are specificto a gamut or print process.  CIELab values are device independent and the only way to geep  the same caolor across devices.  Specificaly 16 bit CIELab though if your colrs contain vignettes or gradients.  

Numbers are color space specific! Generic tables are useless for this reason - unless the color space is specified (which it very rarely is).

Look at the numbers here. The reference is the Lab patch in the middle:

Hex is just base 16 notation for standard RGB numbers. They are as color space dependent as RGB:

If the "brand color" was decided as a hex number in a standard office sRGB environment, but you are looking at it in, say, Adobe RGB, it won't be the same color. A lot of people believe that hex is a definition of a color. I don't know where that comes from, perhaps because it sounds computerish and "geekish", implying precision that isn't there.

A script like this can do that:

https://github.com/johnwun/js4ai/commit/45f13715ce0f983453ca884af1dc612b0bfb5674