Yin was an important official name in the Five Dynasties and the Song Dynasty, and was the highest official in Kaifeng, the capital of the Northern Song Dynasty. Being placed under ministers and assistant ministers, they generally take first-class or second-class official positions. If Chu Jun is appointed, it will be a first-class official.
Kaifeng Prefecture Yin is equivalent to the current mayor of Beijing. Kaifeng Prefecture in the Northern Song Dynasty is the largest capital city in the world, with a prominent position. The prefect is always in charge of government affairs, such as civil affairs, justice, catching thieves, taxation, household registration and so on. Being a prime minister is a springboard, so the position of Kaifeng Yin Fu is more important.
As for the size of power, I think there is no comparability.