One of the frustrating things about buying Asian horror is that there are nearly always many different DVD releases of each film. I stumbled upon this and have found it helpful enough to share
http://www.dvdcompare.net/comparisons/
The next time you are trying to decide if the Tartan version is really worth $20 when you can get the HK version for $10 on eBay, enter the title here and see what you can learn.