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There are multiple factors at work here -- and yes, it's not that well understood. It could be as simple as the difference between having just one seizure focus vs. having several. In the course of a seizure, multiple seizure zones may be activated at once, and one sign or symptom may obscure others. In another scenario, certain symptoms might be produced by activation of a very highly-defined area. But it's also possible for those same symptoms to be produced by seizures that arise from different areas of the brain. Another possibility is that the point of origin may be a fast-moving pathway that connects to another part of the brain; in this situation, the speed of the spreading (the number of open gates, and how primed they are) and the direction of the path might determine the particular aura produced at any given time. As the realtors say, location, location, location...What is the difference between those who consistently have the same aura verses those who have many different auras?
Another big factor is the primary trigger -- lesions, swelling, vascular issues, genetic -- and whether it reflects a condition that is changing over time. Even if the primary condition isn't considered progressive, the brain still changes unpredictably as we age, as well as in response to changing secondary triggers in our metabolism and environment. This can also produce a wide variety of aura patterns.
So... aura patterns are different, because individuals are different. Taxi drivers show greater activity and development in the parts of the brain related to spatial orientation. Teenage boys have less-well developed frontal lobes than girls of the same age. Our neural networks develop in roughly similar ways, but also completely idiosyncratically.