Not all of the dvd versions are the same.
I started with a region 2 version of 101 minutes 35 seconds. This is 1.33, the sides trimmed off. It is much cheaper than the ntsc.
I understand from a review that the fullest version is an unrated region 1 version of 108 minutes and that there is also a rated version at 106 minutes, the difference being inclusion or not of two of the sex scenes. That is Aspect Ratio 1.78
I liked this feature enough to purchase the region 1 NTSC version and my copy had both of these longer versions on one disk, in 1.78 and 4x3 forms, both. They have more detail and in this case that makes for an even better story.
The original Poison Ivy, the first in the series, is also above average. My NTSC disk of that also includes a choice of versions.
It seems likely that the other sequel will be special, too, in its NTSC form.