Tho whom who might be interested:
Here is a comparison between rectangle and square Obsessed by Cruelty patches.
Apart of the obvious size and shape differences there are some more:
The motif is minor in height, it was shorten in this one or stretched on the other versions.
The back is made of an infrequent material, cotton-like soft and prone to deterioration.
In a very close checking, always under the effects of the weed, you can see it's a bit more coarse in the production, as if it had been done with little minus stitches per cm2.
The logo is full dotted even within the whole "o" and the center of the "d" unlike others, and colored in a faded yellow.
There are minimal variations in the design that let you quickly difference it from the most of other versions, i have marked two of them in the last picture.
PD: My particular obsession with this patch it is because is the very first one i ever had. I think in general the differences are little significant and it result to be killer classic patch in all of its versions.