This is the best source of NIL estimates I've seen which has the Gophers NIL collective at around ~7 million. I've also posted several times now that NW was the last B1G school to have a collective, and there is a link to an article from December stating NW fell well short of their $3 million goal for year 1.
nil-ncaa.com
Do I know exact numbers between the two? No, other than football gets most of it. Through the collective you can also donate directly to sports and people are far more likely to donate to a program that has had success under PJ, compared to one who has had none, under BJ.