This one appears to have good chances.

it depends on where exactly the split occurs. If the animal, for example, has one heart and one lung, that should be more stable than an animal with 2 hearts and 2 lungs. with 2 bloodstreams that are somehow connected and somehow seperate at the same time, if one head gets all the nutrients from digestion and the other head gets all the oxygen, thats bad.

but if its feeding without problems for 100 times and gets 2 years old and grows in size, chances are it will work out. Life expectency is still somewhat reduced because if one of the heads dies from natural causes the other head will follow.

unfortunately i couldnt find an update, that im german english bilingual should help, but i failed to locate the reptile zoo in Switzerland that purchased it.