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I have a trial Seomoz membership.  I've been comparing my site to some of the competitor websites and Im confused about the moztrust vs google page rank.  For instance some of my competitors have higher moztrust but my site has a higher google page rank.  Isn't moztrust meant to duplicate google pagerank??  Why would these vary so much?

I read that the google keyword tool is only applicable to their paid results.  I was finding completely different results when using the wordtracker keyword tool.