The guys have the same birthday...why would they have different astrology charts for people to choose from? That being said, you do realize that just by chance, each person has a 50% chance of being right. Just by guessing you would be expected to get the exact same results 1 out of 8 times...This is presuming, of course, that their was no confirmation bias inherent in the in the criteria used to distinguish the two men which could substanitally make correct "guesses" more likely.
Lots of times weird things happen. And when wierd things happen, humans like to make up reasons for such events--god, lucky rabbits feet, prayer, planetary alignment, "vibes", magic, a curse, a humans sacrifice to Zeus, etc. These are lame reasons for explaining unusual phenomona because "corollation does not equal causation". (People who wear bathing suit a lot are more likely to get skin cancer, but bathing suits don't "cause" skin cancer...people who wear bathing suits a lot tend to expose large amounts of their skin to sunlight which is known to cause skin cancer.)
If you want to know if Chinese astrology is true or not, do lots of peoples charts and see if "experts" can tell whose chart is whose...or do charts for several people and see if people can correctly pick out the chart that describes them best with an accuracy far greater than be expected by chance.
And remember, people are very good at fooling themselves...in fact, they believed the world was flat for eons and they sacrificed people to please non-existent gods. Although believing that something is true will make you focus on evidence that confirms that belief and ignore contrary evidence, it doesn't change the facts. Even if it rains after a rain dance, it doesn't mean the rain dance caused the rain. And if it doesn't rain it's not because some god thinks the rain dance wasn't good enough.
Just because "feels" true or amazing or "special" or "meaningful"--doesn't make it so. Evidence is a much better path to truth.