Compare multiple colors

Hi,

Im currently writing a script for Photoshop in Extendscript.
Now Im trying to figure out, how to compare colors to each other. I've mostly tried to stick to wikipedias​ article about comparing colors and using a weighed eucledian algorithm i get a distance which indicates their difference. Comparing 2 colors is no problem with that.

But in my script I have 3 Inputs (Most common color, second most common color, and the third most common color). Now if I want to compare this to their aquivalent part, lets stay I have a Main_tile with their 3 Inputs and a Tile_file with 3 Inputs, I can compare (Common to common, second common to second common..), which seems to work fine.

My question is what happens if my Tile_file has only 1 Input, how do I compare it to the Main_tile?

Example:
MostCommonColorA          compared to      MostCommonColorB            gives me a difference of 50;
2ndMostCommonColorA    compared to      2ndMostCommonColorB      gives me a nother difference of 20; .. which is now 70.

If I compare only MostCommonColors, i get 50. So I'd theoretically be picking 50, but thats not really what I want, so how can I weight it properly?

Thanks in advance for the help!