Howdy!
To take Canadian boards (OEBC) there's 3 parts:
1. written
2. OSCE (clinical/skills)
3. licensing.
I'm currently a 4th year Canadian student at ICO (c/o 2019) and I took the written one in November 2018.
Written Canadian Boards is similar to NBEO Part 2 (which was written December 2018) which makes studying for NBEO 2 easier if you plan to take both. There isn't really a lot of info on Canadian boards (even what you study for - guideline is really vague) and I relied a lot on alumni (class above me) and KMK (a boards prep group) to streamline and focus my studying. I didn't study as hard as I did for NBEO 1 and just went over all the KMK NBEO 2 materials once. Canadian boards is not super difficult but it's hard since you're essentially going into the test not knowing what to expect. I even talked my Waterloo friends and they didn't really know what was expected either.
I don't really know the pass rates for Canadian boards either. I'm glad to know I passed on my first attempt but I don't really have any classmates telling me they failed either (who would?). Also, the print out for Canadian boards just states you passed or failed - there's no raw score on the sheet. As such I don't know if I did well or barely scraped by on the exam - though I left feeling more confident that I passed opposed to NBEO 1. However, I also know a few people who passed NBEO 1-3 with no problems but failed Canadian boards couple times - this is all anecdotal though.
I do believe that those who have the concepts nailed down for NBEO 1 do really well for NBEO 2 since NBEO 1 is more fact-based written test and NBEO 2 is diagnosis/treatment/management (so building on knowledge from NBEO 1). Since Canadian boards is similar to NBEO 2, I think it's important to pass NBEO 1 to do well on Canadian boards.
If you are concerned about cost of schooling: Waterloo is your cheapest option! Its WAYYY cheaper tuition than the US in CAD.
Bottom line: not much info on Canadian boards (even as a student) but I would say pass rates are likely correlated with pass rates on NBEO.