The PR99 Mk2 and Mk3 have a digital counter with zero return, unlike the clunky mechanical thing on mine. They also have XLR I/O, although I'm not sure it's fully balanced. Some versions have two of the little tension arms instead of just one.
Part interchangability I'm not sure about. The motor and control systems probably. The PSU looks like it should although the part number is different - whether the system and audio cards are interchangable, I do not know.
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