Yes the 6600 rings will fit onto a 6603 crankset in the outer and middle positions. They all use 130 mm bcd. Only problem is the 6600 39 tooth ring will not have pins to help it upshift from the inner ring to the new middle ring. So shifting from inner to middle will likely be slower. 6603 middle rings are specifically built with pick up pins to help upshifts from the inner to middle rings.
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