The replacement codes that wont get ported over were at global, category and item level and looked something like this:
<a href="$link" target='blank' title='$description'>$text</a>
Those wont make it over to the new version but you can add them in later is you have tweaked ones. If you didnt tweak them, dont worry about them.
All your existing keywords etc... will get ported over when you upgrade.
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