Other than the watermark on the bottom left corner, I can't see many differences, which makes this less "clean as per the howto:post:relationships wiki.
Aside of that and the weight of the image nothing more. But if you want to keep the other image, I dont have ány problems.
It is more a problem in general. I think there should be some rule clarification about the so called best version of a post. Just created topic #13561..