I am not sure if I am comparing the right files:
In OP06B: "b) Previous study in Canada:
Award five points if the applicant or accompanying spouse or common- law partner completed a program of full-time study of at least two years' duration at a post-secondary institution in Canada, if this occurred after the age of seventeen and with valid study permits.
(The person is not required to have obtained an educational credential for these two years of study in Canada to earn the points, but simply to have completed at least two years of study.)"
While in OP06C, it became "R83(1)(b): Previous study in Canada (principal applicant)
Award five points if the principal applicant completed at least two academic years of full-time study (in a program of at least two years in duration) at a secondary or post-secondary institution in Canada.
To be eligible for points, the principal applicant must have remained in good academic standing (as defined by the institution) during the period of full- time study in Canada. The applicant is not required to have obtained an educational credential for completing a program in Canada; they simply must have completed at least two years of study in a program of at least two years in duration."
So it seems to me that they changed from "complete a program..." to "completed at least two academic years of full-time...", although it is still open to interpretation