At least you would have someone to talk to.
Seriously, this has been their lives. If they each found themself in a separate, complete, fully functional body they would likely suffer from severe separation anxiety.
That said, these are two very remarkable girls.
After being conjoined all their lives as they have, you can be sure of it. The original Siamese twins considered getting separated in order to get married, and they had the money and the doctor to do it. They decided against it because they could not imagine being apart.
(Well, they actually could imagine it...that was the trouble. It scared them completely out of having the operation!)