yeah scizophrenia and multiple personality disorder are different

Schizophrenia - Schizophrenia is a split in perception that causes an individual to become detached, isolated and remote from reality and from the rest of society. A person experiencing schizophrenia might see things in a way that he can only understand. He might also experience hallucinations such as hearing voices and seeing things, paranoia, feelings and thoughts of persecution and feeling like he is in another world.

MPD - an hysterical neurosis in which the personality becomes dissociated into two or more distinct but complex and socially and behaviorally integrated parts each of which becomes dominant and controls behavior from time to time to the exclusion of the others called also alternating personality, dissociative identity disorder;

The scientific difference is that Schizophrenia is an actual disease affecting parts of the brain, wheres MPD is a mentail illness.