What is the main difference between yin-yang school and Taoism?

Yin-Yang School and Taoism are two schools of philosophy in the Spring and Autumn Period and the Warring States Period. On behalf of Zou Yan, Yin and Yang experts deduced the changes of five elements, and paid more attention to physical techniques, which led to the fortune-telling of later generations. The representatives of Taoism are Lao Zi and Zhuangzi, who study more grand themes, such as the laws of the universe, life and history, and focus on the metaphysical Tao. Later, the ideas of Yin-Yang school and Taoism merged, and Taoism became one, forming Taoist belief.