Great scrap and I think a younger, fitter Peter who had a good workrate would batter Arreola. Now, I'm not so sure.
Peter has no boxing skills. Arreola has solid amateur training and can punch rather accurate combinations. Certainly enough to make Peter look like the sorry ass nobody he is.
Sam peter got knocked down 3 times fighting mcCline, and beat him on the scorecards. Arreola comprehensively dominates the fight and knocks MCline out in 4 rounds. Not really hard to figure who would win, Arreola's the bigger stronger version of Sam Peter...
They should hang a bunch of pizza's, bags of potato chips, and king size candy bars above the ring with the winner getting the full bounty of food. I bet under those circumstances it would be a hell of a scrap.