Posit Glorantha as "Rhapsody in Blue".
Posit one game being a standard symphonic orchestra and the other being two pianos (or a symphonic band, for that matter).
"Converting" between the two should follow that paradigm. Same song, different instruments.
PS: The "pair of pianos" was actually Gershwin's original arrangement, for those who have interest. It's quite good when done well.
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