Similarities:
High-luster blued-steel, tapered barrels, no underlugs, older 6.5" length, shrouded ejectors, crane ball-detent lock, case-hardened hammer/trigger, patridge sights, McGivern gold-bead, 4-screw sideplates, wood stocks, diamond pattern checkering, trigger stops
Differences:
Color-case frame(on several), no hammer-nose, rounded rear sight tenon, no front locking bolt(
triple-lock), trigger stop on trigger(
not frame), no 5th screw, new-style thumbpiece, and....well, OK....MIM-parts
Frame-mounted pins have always been on their rimfire models, though the introduction on their centerfires has caused great consternation. Round-butts existed in the beginning and were largely supplanted by square-butts later on. It's debatable just how big of an issue that is, particularly when it comes to aesthetics, which is what this
debate centers around. Ditto the whole MIM parts issue. It seems to me that that the scale tips quite heavily toward similarities, purple shag carpet notwithstanding.