Dissociative amnesia is different from retrograde amnesia because

The major difference between retrograde amnesia and anterograde amnesia is the following: Retrograde amnesia is the inability to recall past memories while anterograde amnesia is the inability to create new memories.

    The  difference between retrograde amnesia and anterograde amnesia is that:  Retrograde amnesia is the inability to recall past memories, while anterograde amnesia is the inability to create new memories.

we need the diagram to answer this correctly.