Yes, I am. And I am also aware of how small the differences can be.
If the image is not manipulated, then where is the large patch of white fur on the front right knee? Where are the more extensive lighter markings along the neck and top of the tail? Flash would only make those things more apparent, not hide them.
If it is supposedly a composite then IMO it is very good; and also a very difficult composite to execute convincingly (if not impossible).
I can only judge based upon the limited information/images provided... maybe they had different/additional information that I/we don't.