that assumption is from this message thread,
https://forums.adobe.com/message/2670981#2670981
close to the bottom of the thread, member aanavaras asked on Dec 7, 2012 if there are any updates on apis with Acrobat 9's compare technology, member Irosenth replied on Dec 8, 2012, that "Acrobat 9, X, Xi do not provide programmatic APIs for comparison".
Maybe Irosenth meant to say programmatic batch APIs for comparison?