Instead of knowing or learning the exact color code, HEX/RGB, it would be really great to actually work with the HUE, saturation and/or black level.
Within the design system that I've created, the primary color is 204 on the HUE level and every other blue color will have that starting point.
In Adobe XD, I cannot change the HUE level based on an actual number, but by guessing, which is frustrating and a wrong way of working — I'm currently working with PS opened, just so I be able to work with a proper color picker.