As far as I know, the big hotel section in any Ent book is exactly the same. The HoJo Anaheim super special discount is the same no matter what book you get.
So I'd say that it gives you no better discounts on hotels. Or even entertainment...my book from western wa has Universal discounts and Seaworld, too.
The main thing you get if you buy a book that's local is discounts to local restaurants. But from what I've read, there are really no discounts to the places close to Disneyland, b/c those places don't NEED coupons for people to visit them.
You can preview parts of the books on the entertainment dot com site, just put in the zip code...