What's the difference between eight characters and six hexagrams?

I think there are three major differences between eight characters and six hexagrams.

1, eight-character heavy heavenly stems (heavenly stems take the initiative), and six-legged heavy earthly branches.

2, eight-character weight (for example, a wooden day is too strong, like fire. However, there is water in the sky, and water can overcome fire, no matter how strong or weak. That is, the combination of repeated dry head and bad luck), six hexagrams are heavy and practical, even if you change your head with a god or have a move, it depends on your strength and whether you can do it

3, the application of empty death is different.

..... for reference only.