What's the difference between Longjing in Shengxian, Xinchang and Xihu producing areas? How to distinguish

The frying method in Shengxian county is a little different from that in Xinchang. The tea in Xinchang is green and takes a long time to dry, so the fried tea will be red. Now Xinchang's tea is basically fried by machine, with good flatness and good gloss. However, the tea in Xinchang is yellow, and the tea in West Lake is the real green tea. Longjing in West Lake is fried by hand, so the wrinkle is much more than that in Xinchang and Shengxian. It is difficult to tell the difference between Xinchang and West Lake, especially if you are exposed to tea frequently.