Honestly, I hope you're right a22, but I think you're going to need a lot better evidence than trying to point to matching moles, shoulder blades and feet. I personally don't think you can draw any reliable conclusion from the two pictures that you posted. If I had to guess I'd say it's Marisa Miller and not Hayden. I'm basing my conclusion on the fact that the original photo shoot involved Marissa Miller. If you go look at the Marisa Miller thread you'll see all the photos for this spread in sequence, along with this one and they all seem to match. Match Marisa Miller that is. Furthermore, why would Marisa Miller who has done lots of nudity, allow someone like Hayden Panettiere to appear nude in place of Marisa, in a photo spread that's attributed to Marisa? It just doesn't make sense to me.
Like I said before, I certainly hope I'm wrong and I certainly appreciate the fact that you're trying to show that there may be discrepancies, but right now I'm not buying into it.