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Yes, that is correct.
Once you have it set up, you can test what pages are blocked in your GWT account. Health > Blocked URLs > select which bot you want to test at the bottom of the page.
Resources:
Google's bots - http://support.google.com/webmasters/bin/answer.py?hl=en&answer=1061943
WMT Blocked URL testing - https://www.google.com/webmasters/tools/robots-analysis
Might have to do with canonical urls.. pretty sure SEOMoz report doesn't take that into account when they tell you which pages are duplicate.
Best thing to do is check out what pages are getting picked up by both sources and compare/contrast similarities/differences.
In case you haven't seen it, check out this post
http://www.seomoz.org/blog/the-bigfoot-update-aka-dr-pete-goes-crazy
Talks about domain diversification and ranking fluctuations as of recent.
This has been happening for a while now. We use rank tracking with 100 results per page and the ranking results are usually different than comparing it to 10 results per page.E.g. 10 results per page ranking = 19, 100 results per page ranking = 33
First time we noticed this was back in March 12'.. although it could have started earlier than that.