What is the difference between the left ear hook and the right ear hook in calligraphy?

I think there are two differences between the left ear hook and the right ear hook. First, the vertical of the left ear hook must be vertical, while the vertical of the right ear hook can be written as vertical and vertical; The second is the writing method of transverse hook. The hook of the right ear hook is more stretched and wider than that of the left ear hook. Family statement, for reference only.