Why is the difference between the first part and the second part of "The True Color of Heroes" so big, and the shape of Chow Yun Fat is so different?

If you have seen Chow Yun Fat being interviewed by foreign media, you will understand. Because Fage said that he didn't want to repeat the role, when he won the first step, John Woo and Fage didn't want to make a sequel, but there was no way. The film company and Tsui Hark are determined to open, and have sold all the screening rights, so they have to shoot the second film. So John Woo set up another role-A Jian.