Why are the eight characters of fortune-telling websites different from those of fortune-telling? High score for help!

The five gods and four pillars can be worked out by themselves. But many things are changing, and the surrounding environment and solar terms will be affected. Therefore, eight characters are difficult to calculate and there are too many variables. Was the person killed at the same time on the same day in the same year? Can you see if the calculation methods of the two masters are the same?