The trial versions of Premiere Pro and After Effects contain all codecs that are in the full version. There are no differences between the trial version and the full version for Premiere Pro (except that the trial version expires, of course).
There is no trial version of Encore.
See this:
http://adobe.ly/hcOibb
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Todd Kopriva, Adobe Systems Incorporated
product manager, professional video software
After Effects team blog
Premiere Pro team blog
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