I think Prime McCallum beats the mw Jones. Jones just was too in-experienced there and only his physical talent won´t be enough against McCallum.
McCallum has the tools to beat Jones in my honest opinion, given the way their actual fight played out(with a shot McCallum), McCallum's constant body attack and boxing brain, etc. I certainly see it being a lot different than their LHW encounter, when even then McCallum was able to trouble Jones at points. Not sure who I'd pick outright.