Doubtful....they both had so much natural power, once they started tapping on each other, it would have to escalate into war.
I don't think any amount of padding could have protected either combatant. Sparring rings are generally pretty small as well. Having two hitters with power of that magnitude, could have potentially resulted in one or multiple injuries, jeopardizing their careers.
The sparring probably wouldn't have lasted more than two minutes, each trying to prove something to the other.