Redirect of just one internal page

[kolio_kolev]

If I have 2 domains with different content that are in same topic, and each one lives on its own IP-address, what could be the result if I do permanent redirect of just one internal page from one domain to counterpart page of another? What if I use rel=canonical instead of R301?

Thank you!

[Goetzman]

Any reason why you don't wanna use a 301 Permanent Redirect Sub-Page from one domain to a Sub-Page on another?

[kolio_kolev]

Actually I'm asking about SEO consequences at whole. Let us say that I've choosed to use R301. Would the search engines decide that my domains are duplicated (even if content is less than 4% equal by copyscape.com) or the redirected page flows its juice to counterpart page w/o any penalties from SE? Something else that I have to beware of or must do?

Thanks!