I'd say, unofficially, that you could probably pass v7 from v6 courseware.  While I haven't seen the v6 stuff, enough of the covered stuff in my exam reached back, even, to my original (much older) CEH, that I could've passed, without 7 materials.

I'll say that, with one catch, though:

There were some things in the exam that were newer than I remembered.  I knew those too, so it wasn't a hindrance to me or anything.  But if you aren't fully comfortable with the v6 materials, etc, the lack of v7 might be just enough to make you fail, if you have trouble on the v6 (and older) questions...  Something to consider.