If both teams agree to a rematch it shouldn't be a problem. Just be sure to arrange it before the finals, so that I can schedule it and, if needed, edit the brackets and matches.
Hell, if you guys want you can even do an unofficial rematch, just to see who would win if things went differently. Like using another map or something. Call it a training match.
On the subject of scheduling: Crushing vs Mystery Magic at 15:00 and Casuals vs Pizza at 16:30? Casuals have confirmed, so I'm waiting for Pizza, Crushing and my own team to confirm. (Depending on if there is a rematch or not these might change, so it would be handy if every team could double check now if they're available for both times or not.)