It's definitely not the same condition - like in most cases in psychiatry.
Unlike in medicine, when you can often classify problems by their pinpointed sources (e.g. a virus/bacteria), in psychiatry it's usually a set of genes and other factors that comes into play, and various subsystems that broke down giving a certain outcome.
We group psychiatric disorders the way we do it, because the science for distinguishing the sources of disorders isn't good enough yet to have a better system.
It's similar to the taxonomy of plant&animal species before the advent of genetics. We had to group them by the way they looked, not by their real relationships.
Unlike in medicine, when you can often classify problems by their pinpointed sources (e.g. a virus/bacteria), in psychiatry it's usually a set of genes and other factors that comes into play, and various subsystems that broke down giving a certain outcome.
We group psychiatric disorders the way we do it, because the science for distinguishing the sources of disorders isn't good enough yet to have a better system.
It's similar to the taxonomy of plant&animal species before the advent of genetics. We had to group them by the way they looked, not by their real relationships.