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I think it certainly wouldnt hurt to redirect your old site.com/page.html to your new site.com/page. if there is any linkjuice directed to the old page (the .html) 90-99% of the linkjuice will be transferred to the new site.com/page with a 301 redirect.
We have the same problem with reference to duplicate pagetitles in the Moz crawl errors. Has anyone found a solution for this already?
I think it certainly wouldnt hurt to redirect your old site.com/page.html to your new site.com/page. if there is any linkjuice directed to the old page (the .html) 90-99% of the linkjuice will be transferred to the new site.com/page with a 301 redirect.