Yup, comparative pieces are on the study design and are examinable.
However, as was noted in
this thread a few weeks ago, the 2011 experience screwed up the state and they received even more complaints than usual. For the past two years they've stuck to safe ground, but as we approach the tail end of the study design, they might be looking to shake things up.
Practice both and you should be fine.
2011 was the only instance this happened though; even most Practice Exam companies (CSE, Insight, TSFX) don't tend to publish many comparative pieces.
And even though the 2011 blog was a horrible example of the task, I do have a scanned copy (as well as all the other exams and visuals in case VCAA restrict copyright on those too)
A list of stuff that isn't available:
-article and visual from 2008
-the visual from 2009
-everything from 2011 (including the background info

)
-one visual from 2012
I'm aware not all schools give out copies, and there's no reason why some students should have that advantage when it was VCAA's screw up. Anyone who wants a copy, PM me your email and I'll send you the file. Can't post here for copyright reasons :p