Why does SEO moz show so many more duplicate page titles than webmaster

[Stamats]

My SEO moz duplicate page titles are more than double the webmaster duplicate page titles.  Plus, some of the items appearing in SEO moz are not really duplicates.  Anyone else seeing this?

[watkinsheating]

Mine is the opposite. Gewgil wbt is showing several duplicates that seomoz missed. Maybe you have some pages blocked to google that moz is crawling anyway? I just use the reports as guidance. In the end, what google sees as a dup is all that matters.

[mybinding1]

For my site it is pretty common for SEOmoz to find things before WMT and for the items to disappear from my dashboard a lot sooner than in my WMT account.

I am always looking at both sources to figure out the issues that need to be fixed.  Generally I find that SEOmoz is more comprehensive in finding duplicate page titles on my site provided that they are internally linked and within my 10,000 page crawling limit.  WMT will often identify pages that I forgot even existed or that are orphaned.

As far as SEOmoz showing pages that have duplicate titles that aren't duplicates I have only seen that a couple of times and it fixed itself with the next crawl.  I attributed it to a glitch and haven't seen it recently.

[OlegKorneitchouk]

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.