I don't know that it does differ from just talking about trauma, necessarily, except that for some people this conversation(s) will be the first time that they form a coherent story--one with a beginning, middle, end, with events considered in their proper context, memories placed on a timeline, with some sort of order coming out of a confusing and frightening mish-mash of disembodied emotion and gauzy half-memory.

Sounds like a hell of a task. Not something I've done personally. Hope it works out.