Two different content for a single keyword

[kingp]

I hope the title explains it. A single keyword which is a rare one should or can have two different content. I know it sounds odd but its true. So, here is my query that if I build two content pages then how can I get index and ranked just one. Its not debatable that whether or not I build only single page. I have to build two pages.

Have you not thought about blocking the unwanted page through your robots.txt file?