Differences between Zhang Zhongshan and Kong Xuan, Shen Shi

Hello, do you want to ask what's the difference between Zhang Zhongshan and Shen Shi Kong Xuan? The difference between Zhang Zhongshan and Shen Kong is that Shan's masterpiece is Positive Solution of Geography, while Shen Kong was written by a master of Feng Shui in Qing Dynasty. Zhang Zhongshan is a master of Feng Shui, and his masterpiece is Correct Understanding of Geography. Shen Shi Kong Xuan was written by Shen Zhu, a geomancer in Kong Xuan in Qing Dynasty. He died before finishing the book, which was published by his son Shen Zumian and his friends according to his manuscript. There are four volumes.