According to the common annotations in Chinese writings, the changed hexagram is very often called Zhi Gua (之卦) or Cuo Gua (錯卦), and to my knowledge, they are regarded as:.
Zhi (之) means: to go to (position Y from position X), and Zhi can refer to: A) Line 1 goes to position 4 (or any other position in the forward direction) and exchanges positions with line 4 (or the corresponding line ahead) within this hexagram, or line 4 goes to position 1 (in the backward direction) and exchanges position with line 1 (behind it), or B) hexagram A goes to hexagram B after the moving line is changed, for instance, Hex 8 is the Zhi Gu of Hex 3.1.Theoretically speaking, Zhi is just a movement and this movement doesn’t specify ‘forward or backward, i.e. future or past’. Most of Chinese diviners are inclined to refer Zhi Gua to a resulting hexagram because of their reading method and because they seek the advice of the future or the possible result
Cuo Gua (錯卦): Cuo (錯) signifies to intercross. When all the lines of a hexagram change, the changed hexagram is the Cuo Gua (錯卦) of the original hexagram, for instance, hex 11 and hex 12. From the side view, these two hexagrams have access to reach each other laterally, as all of the masculine and the feminine lines of these two hexagrams can mutually respond at their corresponding positions, suggesting they are the cause and effect of each other mutually.
Therefore it might be the reason that most of Chinese diviners do not intentionally talk about the cause and effect of the original hexagram and Zhi Gua since in their reading methods only the specified ‘moving line’ can make a change.