Pretty spooky I have to say. Some of the characters are

.
There are however some things that look like habits that I don't see reflected in Z's writing and I would expect to. Still, it's in the right ballpark stylewise. It certainly looks like we could have a field day finding matches for quite a few of the single characters. That, a fair comparison doesn't make ... I'm afraid.
Would need to try and match up whole words, especially when there are similarities because we want to be as sure as we can be. In doing that you are also checking line flow and word relationships. Another level to check.
EDIT: Ahhhh I was wondering ... just noticed in the PDF title that he DOES have a middle name. That makes 13 characters. For some zync.