Yes, it is possible for someone to have Complex Post-Traumatic Stress Disorder (CPTSD) and experience "parts" without having a co-morbid Dissociative Disorder with alters. While both CPTSD and Dissociative Disorders involve experiences of trauma and dissociation, they are distinct conditions with different manifestations.
In the context of CPTSD, the term "parts" refers to the fragmentation of the self that can occur as a result of chronic and severe trauma. Individuals with CPTSD may develop different aspects or parts of their personality, each with its own set of emotions, beliefs, and reactions. These parts can represent different adaptations to cope with traumatic experiences and can lead to internal conflicts and difficulties in emotional regulation. However, in CPTSD, these parts typically don't reach the level of fully developed, separate identities, as seen in Dissociative Identity Disorder (DID).
On the other hand, Dissociative Disorders (including DID, OSDD, and DDNOS) involve more pronounced and extreme forms of dissociation, where individuals may have distinct identities or personalities, often referred to as "alters." These alters can take control of the person's consciousness and behavior at different times, and there might be amnesia between these dissociative states.
So, while "parts" in CPTSD and "alters" in Dissociative Disorders share some similarities in terms of representing different aspects of the self, they are generally different in terms of the extent of separation and control over the person's consciousness and behavior.
It's essential to note that diagnosing and understanding these conditions require the expertise of mental health professionals. If someone is experiencing symptoms suggestive of CPTSD, Dissociative Disorders, or any mental health concerns, seeking help from a qualified therapist or psychiatrist is crucial for accurate assessment and appropriate treatment.