I may be uniquely positioned to testify on your question. I own one of the first SMTA's (60177) and one of the last 660's. These two tractors would represent the entire production life of the planetary IPTO.
As far as I can tell, the only difference on the 660 is the long operating lever and linkage, as well as the rear plate for attaching a right angle gear box. That plate was first used on 300 Utilities that couldn't be fitted with the side mounted belt pulley.
Otherwise, I don't think there is any difference but I will look tomorrow and add to this thread if there is.
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