According to NECA on twitter it's Wal-Mart only. I never once even saw the Endos at wal-mart. Someone pointed out that the mouth looks a bit different, but NECA says it is just a re-issue, so I doubt they would re-sculpt the top part of the head and the lower jaw just for a Wal-Mart thing. Seems like it may have the teeth elongation issue some of the Xenos oin the AvP 2-pack had...
EDIT: Yeah, now that I study the pic more, it does look like the teeth elongation issue. The front lip seems to be in the same lowered position, the side of the lips don't seem to have changed at all, and if you count the teeth, the first one toward the rear is correct, the second one after that (the elongated canine) is correct and the next one after that is correct, however that 4th tooth at the front of the mouth should be way shorter and it's as long as the one before it. Also for the bottom jaw, the lip position is identical, it's just the teeth that got longer.