Locks will happen on both updates. The difference might be the JOIN type which uses different standards. The first query uses ANSI-92 standard and the second one uses ANSI-89 standard. AFAIK, both queries will be interpreted the same way.
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2