UruKat, I have the DVD version of The Walking Dead (game of the year, which inclues 400 Days) and the TellTale download version of Season 2 (plan on getting the disk version when the whole thing is out
). When installed, the TellTale season 2 version searched for previous saves and was able to find my disk version's without any problem. I assume the same would be true of the Steam/TellTale versions as well. You may want to ask on TellTale's forums just to be on the safe side, but I assume the two versions will be able to recognize one another.