I think that it's time consuming enough to get to know your natal chart intimately enough for it to help you and give you "clues" throughout your life.
So my suggestion would be to learn all about your natal chart first... and then delve into the unending world of astrological research - which really can distract you from ever being identified with your natal.
Also, you should relate to the chart that is 9 hours different. It isn't all that different, unless you are using it to "time" events.... in which case you need to use the exact chart where you "took your first breath" as Alice suggests.
Theoretically we should all "relate" to a chart drawn for dawn, noon, sunset....the moon does change a few degrees, yes, but since the moon has a big orb for aspects, I doubt it would change the "character" of the person.
I saw this work personally once. A client of mine divorced her husband and was about to marry someone who had his exact birth date. I couldn't believe it. I said, "you're marrying the same guy!" The things you hated about your ex are inherent in your fiancé. She didn't believe me. It took about 3 years before she kicked him out. He was actually worse... because he HID his shortcomings as long as he could. But eventually she saw she had, indeed, married the same man....though each looked totally different....and "seemed" different.
LIN