Are we suitable? I have the same blood type as her constellation, four years and four days apart!

The same constellation, the same blood type, may not be very compatible, and may not be very incompatible. Because in the west, the constellation is just a general statement. The real fate of western constellations is a life chart like China's Wei Zi Dou Shu, including your birthplace and time. The general constellation can't explain all people. Moreover, all fortune-telling is only an auxiliary tool. They didn't control your destiny, but you created your own. As the saying goes, fate is in our own hands, so why bother?