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That is likely the cause of the discrepancy, although Moz Analytics crawls can be deeper than Google, unearthing more data than Google has gotten to yet. That being said, I would be hesitant to rely on the canonical tag so much. I did a cursory crawl on your site and found that roughly 20% of the first 800 URLs crawled were duplicates (albeit with the canonical tag). You could potentially eat up your crawl budget from Google if most of the new URLs it is finding are duplicates. While you won't have problems with PageRank dispersion or duplicate content, per se, you will get a shallower crawl of your site. Google isn't going to keep digging if it keeps unearthing the same stuff. You might want to consider using robots.txt to simply block some of the sections like the /catalog/product/view/ directory if it isn't driving organic traffic and is a source of a good deal of your canonicalized duplicates. Hope that helps!

Thanks or the help. I've read that google can sometimes not be as accurate at reporting links as well. I'll look into the disavow option.