I wonder if it is possible that the person may have saved the image from the forum in an attempt to maybe Photoshop it themselves ( I think we have all done that from time to time!) ...trying to improve the original and then maybe mixed it up in their computer and reposted it thinking it was theirs ??
I dunno really, its I just can't picture (pardon the pun) any of the good people here doing that....maybe I'm wrong
Then maybe they are just very very similar.......I guess you can't re-compose the stars!!
cheers