Wow, that's pretty esoteric. :) Hard to relate to for me. What I'm learning is outside the body, spirits are pretty much the same, which is why we can reincarnate as either. But most tend to stick with one or the other because they get used to how to act, and changing gender can be awkward.
I sometimes wonder if that isn't the issue for some of these people who feel like they're the wrong sex--maybe they've come from 15 lives in a row as a woman, and still instinctively feel like a woman, even though they're in a man's body. Just like when you drive a new car, you may instinctively go for the clutch, even though you know it's an automatic.
Don't have any more clear information on that though. :)