At the risk of wading in where I don't belong...
I presume the image in question is the one from here:
Martyn Iceberg which is quite similar to Josh's image:
Josh Holko IcebergIt seems clear to me that these are different images. The sky is different, the pattern of waves on the water is different, there's less reflection on the water of the Holko image (CPL filter?) and the perspective is slightly different, with Holko's image being taken from slightly further away.
I think Kevin's explanation is the right one, two guy's in the same boat taking photographs of the same iceberg. I'm sure either/both authors can confirm this.
Again, I'm sorry to stick my nose in, but potentially false accusations of dishonesty, lying or theft get me worked up in a way that little else does. I do my best to steer clear of the "Coffee corner" forum and I would make a terrible politician...
Mike