Another vote for the 'they're the same person' camp.
1) I've compared two sets just by clicking on a link in this thread and the first on the Michaela Fenclova thread. If you look at the moles you'll see that they're the same, just mirrored. I've seen loads of photo sets where they switched certain images round for aesthetic reasons or whatever so that the girl in the pics appears to have moles which switched sides during the shoot!
2) Photoshop. It's very easy to remove moles if the photographer or website desires. Tattoos also but it can more tricky depending on the shots.
3) matadorstuf knows his stuff and I'd agree with him
4) Anyone who disagrees, please, please, please don't EVER give witness evidence in court. Seriously. I'd be concerned that you'd have trouble recognising your own family members to be honest! ;-)
5) Oh yeah. She looks the same in all the photos. Bit of a giveaway that one!