Footnote 11: CSA ii, p. 35 (which is found on p. 152 of the Choong text) is linked to the text here:
The corresponding SA 296 is different in expression; for example, it reverses the sequence, beginning with "conditioned by ignorance are activities". However, the message is the same in both versions.
I do not see an acknowledgement of alteration of the āgama source text here, did you find it elsewhere?
The Buddha encourages us not to ask questions with the intent to ensnare the answerer and make him look uninformed, however, in this instance, it is perfectly reasonable that Choong would cite this. I was very surprised that he didn't. I myself have looked through his book before for citations of alterations to texts of the āgamāḥ he deals with. I have not found any. If you have found some, that would improve my opinion of Choong Mun-Keat as a scholar.