What's the accepted practice here? One added with the UPC and the other using and alternate UPC? Both are legitimate releases and from the same company, Unearthed Films. What makes it more interesting is the fact that one is also a box set, which is, incidentally not done properly, so I'll fix that as well.

UPC 820360-101892
Guinea Pig: Mermaid in a Manhole/He Never Dies
Guinea Pig - Flower of Flesh and Blood: Director's Cut

Flower of Flesh and Blood does exist under different UPCs, presumably later releases that fixed the UPC error, but not the one I have, which was purchased at release. Incidentally, this film comes with a making of feature that the film makers were forced to provide because Charlie Sheen reported it to the FBI, thinking it was a real snuff film. I believe they also had to produce the actors in court to prove that no one was actually dead. 

Thanks. It's the first time I've encountered the same UPC. I've used it lots for alternates on disk ID as my focus over the last year has been largely on adding content to box sets. Just wanted to confirm as it's always a pain when you contribute something only to have it rejected.