What's the difference between a tiger head and a lion head?

At present, there are three kinds of Tibetan mastiffs: tiger head, big lion head and small lion head, and the colors are also classified as follows: snow mastiff, yellow mastiff, red mastiff and gray mastiff. The differences between eyes and mouth and face are: eyes have triangular eyes, mouth has a big mouth, old people's face has a flat mouth, etc ... As for the difference between tiger head and lion head, tiger head is higher, slightly milder than short-haired lion head, while lion head is usually flat mouth. Long hair is fiercer than tiger mastiff, but it is not as tall as tiger mastiff. Good Tibetan mastiff producing areas are: the lion-headed Tibetan mastiff in Hequ, Tibet, and the tiger-headed Tibetan mastiff in Yushu, Qinghai (I don't know whether the legendary Tangut Tibetan mastiff is good or not). There are many questions to answer. If there is anything wrong, please criticize and give directions.