I haven't heard of any specific % cutoffs. The lower the better. Here are a couple useful tools.
hXXp:// webconfs.com/similar-page-checker.php
hXXp:// copyscape.com/
I haven't heard specific cutoffs for % of what is acceptable or not but here are two good sites for checking the similarity:
hXXp:// copyscape.com
hXXp:// webconfs.com/similar-page-checker.php
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