Msratty
Not meant to offend, but a cap change in a crossover can have a pretty significant effect on the sonic signature.
Interestingly, I just found this write-up by Srajan Ebaen at 6Moons that may be the first comparison between the older Ref3 version (that I also have no plan on selling) and the newer 3.1:
http://www.6moons.com/audioreviews/gallo7/comparison.html
In this case, I am not really sure if the cap upgrade was meant as an upgrade or due to the new drivers, but the article states, "Gallo also replaced the non-polar electrolytic capacitor in the 1st-order series crossover with a metalized polypropylene equivalent said to eliminate a grayish coloration in the midrange as well as to enhance low-level information."
I assume the above info was from Anthony.