Calculate highest percentage of 2 pairs between a range

Hello,

I have been trying to find a way to do a certain calculation in excel but with no luck so far. I just simply can't figure it out.

The names in the table are irrelevant. Please have a look at the results column in the attached workbook as it is clear what I'd like to do.

If there is an easy way to get the highest percentage, it would be simply amazing.

Thank you

Sans