What they should do is have the first round Boxing, second round MMA and then alternate form there, see who beats who first.
Floyd being the A side gets the first crack with the first round being Boxing only.
Even if they still used Boxing gloves and had it in the ring, Conor would still beat Floyd under MMA rules.
Conor could survive a round in a Boxing match with Floyd, Floyd wouldn't last 3 minutes the second round.