There's a catch: it's the Jones of the first Tarver fight vs. the Barkley that out-pointed Hearns in a rematch.
I'd still take Roy by decision, if not late stoppage. Barkley enjoyed a career resurgence (and career-year) in '92. Having said that, even this specified version of Roy would've done just as well if not better against everyone Blade faced that year.
Jones Jr would destroy Barkley. Shut out decision or KO for RJJ. edit: Didn't see the catch. That would probably change my opinion to a close decision that could go either way.
I would still pick Roy, but it'd be closer and more difficult In his prime? forget it... he lands at will