Yep, they're pretty similar. Generally with HDR 3 - 5 exposures are good for me.
With focus stacking, it depends on the area that I'm working with. Just have to make sure that the focus on each shot slightly overlaps the one before. Best results come from largest aperture (lowest number) for exposures. That leaves lots of bokeh in the image where you don't want the focus. The camera just has to be able to manually focus each shot.