They are not. Dissociation is dissociation is dissociation. It is only the way people interpret things that changes. It doesn't present differently in different parts of the world, it isn't caused by different things in different parts of the world, and it doesn't respond to different treatments in different parts of the world. The experiences of dissociative disorders are the same all over the world. The differences are in how 'the powers that be' interpret them, label them, define them and treat them. And even then you will find that at one end of the street one clinician will believe, define, interpret and treat dissociative disorders one way - with their own unique understanding - while at the other end of the same street another clinician may have a completely different understanding of the same thing. The differences are not so much in what the diagnostic manual says, but in the individual clinicians experience, training and style. Take the DSM-V, for instance. Even though the wording is the same in every copy of it, how it is interpreted and applied in real life situations is dependent on the rationale of the reader.
The international society for the study of trauma and dissociation (ISSTD) has the most widely understood and accepted up to date information about dissociation and guidelines on how to treat it in the world. And it is agreed upon! By people from many different nations! Based on scientifically sound research and data from clinicians all over the world!