I wish I could answer this question, but it's almost impossible to do without having both the gun and barrels in hand so you can make the appropriate measurements & calculations between the two.
Repro barrels are really close to exact replicas of Remington era Parkers with 12ga's on a 1 1/2 frame, so I would assume the chances of fitting a set to an original Parker would be better with both the barrels & action being the same frame size.
Sorry I can't be more help, but when we're talking about swapping parts on a hand fitted & filed action, it's a total crap shoot.
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