Well I haven't taken CM and I've never actually done ABRSM either but I have heard a lot about both
I can't actually answer everything, but I think you will need to buy the syllabi for CM (on MTAC's site) or ask your teacher if he/she has a copy. And as you probably know, ABRSM goes from Grade 1-8 while CM goes from Level 1-10; I'm not really sure how to compare them
The
ABRSM syllabus looks a lot more specific (in terms of what pieces you have to play). The CM offers a
much wider range of pieces that you can play... (don't quote me on that last one though)