I had a discussion with Gary Dunckel (drzooz) about the differences between male and female jams, and he mentioned that on both sexes, the shoulder straps were both sewn 2" apart, and hipbelt padding is the same. In general, he said that the women's pack felt fine for him. Based on that, i ordered a women's jam. Because the women's only go up to a size medium, you would have to make sure your torso is within that range ( if youre a men's large, youre outta luck). Companies market their packs as having slightly different curvatures in their harnesses and belts, but Gary didn't seem to notice any difference. My take on it is that even if there were a slight difference in curves, in a pack this lightweight, with the lightweight loads I intend on carrying, I doubt i'd notice.
That all being said, I can't see a reason why the pinnacles would be any different than the jams. good luck!