Are Emperor Yan and Shennong the same person? Also, was Hou Yi from the same period as Huangdi and Yan Di?

Shennong is a legendary inventor of agriculture and medicine. Shennong is another legend who has made great contributions to the Chinese nation after Fuxi. He invented farming technology, and was named Shennong, also known as Yan Di, because fire was king. However, whether Shennong is Yan Di has always been controversial in academic circles. Houyi is the hero of the folklore "Houyi shoots the sun". There are two names with the word "Yi" in history: Yi who lived in the era of Emperor Yao; Houyi lived in Xia Dynasty and belonged to a poor tribe. The ancient books recorded "the third day of b √", "shooting at the sun with great righteousness" and "Houyi usurped power". It is academically controversial which one photographed the sun. According to folklore, Chang 'e's husband is a hero who shoots at the sun. But there is no unified statement about which one it is. But no matter which one, it is not an era with the Yellow Emperor! ~