Yes, the ratios are different between the planetary and clutch type IPTOs. In addition, because the 560 ran faster than the four cylinder, that accounts for another speed difference. However, some 560s may have come from the factory with the earlier planetary IPTO.
I have a 660 with a planetary IPTO. Due to 2400 RPM engine speed on that model, it is possible that all 660s used the planetary. Too lazy to look it up and risk a potential brain warp while sorting out all the different parts, IPTOs, and tractors.
Without checking my parts book, there may be as many as four different IPTO driven gear/driving gear gearsets in the clutch/TA housing.
If you need correct 540 RPM, you can only replace same style IPTO with one that is similar in the SMTA thru 660 tractors. Without checking the parts book, one might assume that the couplings are different so that a farmer would not be able to make field changes that would be dangerous.
Do your own research at the CaseIH on-line parts book.
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