If the search engines know who owns the domains from the whois information then logically there should be no advantage being on a different class-c for domains with identical whois, but there is. I don't think they use whois info as standard, perhaps just for investigating spam sites manually.
Google also know what domains you have registered in your anlytics account, webmaster tool, Adsense account, what mx records are mapped to Gmail for domains etc.
Should we worry about this? Do you have multiple Google identities? Do you vary your whois info?
Are we talking theoretical risk or real risk?
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