Your not comparing apples to apples, if you look at panels in general is seems they all have similar SKU#’s but each independently different what our comparing is two different model SKU’s different wattages etc. I assume the the -72 would be a 6’ panel. As I stated earlier I am sure someone with more Panel knowledge could spread more info on the subject. I’m optimistic about the possibility but would love to hear from those who are actually educated in this area instead of speculation....