ah, yeah, that is the crop dropped into the other background. The exposure must be just a tad different. Funny, now that I see it if I go back and look at it I can just see it.
Are your montiors calibrated? My home montior is, and the brightness is dialed way down. It sure helps with printing, but the monitor image isn't as dynamic or vivid as it could be. I miss that sometimes, but when I print it makes it so much easier. Makes soft proffing more accurate. Not that I am any master at this at all, I just followed other peoples advice.