I will start by saying that I am no expert but and some of this is just speculation. I have been looking for a center console since Jan and when I looked at pictures on here I started to notice that there where to diffrent designs. Then I found one in April and tried to put it in it was 6in off the floor in the rear. Then last month I found the other style and it fits perfectly. I have heard from many people on here that there is no differences between standard and regular cab but that is the only thing I can think of but they are for two diffrent floor designs. Here are some pics to show the diffrences.
The one on the left is much wider and fits in my extended cab. It also is much diffrent around the shifter in fact the whole piece comes out of the wider console.
Here you can see the differences in the floor contour
Here you can see wider one with the kick out