They share the same skeleton, but the parameters and rules may change a little bit in different time. After tens to one hundred years, the error became clear. Ancient Chinese could not tolerate this. They modified somethings, and a new calendar was issued. By the way, Chinese have used the parameter 356.2425 since fourteen century or even earlier.
Political reasons are also important.
Compiling calendars is the privilege of courts. When a new dynasty rose, the creator changed the calendar to show the new harmonic relation, e.g. tuning the position of start months. We do not know the whole details of them, but they seem close to the above skeleton. It takes time to learn them all. I choose it as an example, because it is almost the same as the skeleton.