I have version 1.3 of Cards Against Humanity, but it's got different cards than the free to download PDF file. Which cards are different between the various versions of CAH? Since I've also got some blanks from the expansion pack, I'd like to make some new cards without duplicating anything.
Between the original and version 1.2, it seems like they got rid of a lot of cards that mention proper names. It seems that cards mentioning Glenn Beck have been removed in 1.3. The second post indicates that at least 8 black cards were replaced and 80+ white cards were changed (though some changes seem small) between the version that came out in early 2012 and the previous one.
This page also has a link to a PDF file (must login) that lists some changes for the first expansion (v1.2 Changelog). Here is a summary:
A bunch of white cards were added:
Some white cards removed:
A few minor corrections as well.
A bunch of black cards were also modified: