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Pointing them to unrelated content using 301 redirect will not hurt your rankings.
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This is true, but the old pages will eventually be dropped from the index. Changing the content on the old pages and adding new pages with the revised content gives you the best of both worlds: your existing pages are still indexed and your new ones will be indexed as well, very soon in fact.
My point is that Google loves lots of content. IMO adding new pages is better overall than simply replacing old ones. In this case, instead of 18 pages there will be 36, which means twice as many ways for visitors to find the site via Google.