About this, when DC3 beats WW2, the #1 in China will be bigger than #1 DOM, the #2 in China will be bigger than #2 DOM, ... until 4th spot. It will be the first time it happens.
Before DC3:
DOM vs China (I use current ER for Chinese grosses)
1. The Force Awakens (936) vs Wolf Warrior 2 (880)
2. Endgame (858) vs Ne Zha (778)
3. Avatar (760) vs The Wandering Earth (721)
4. Black Panther (700) vs Endgame (658)
After DC3:
DOM vs China
1. The Force Awakens (936) vs Detective Chinatown 3 (over 1b)
2. Endgame (858) vs Wolf Warrior 2 (880)
3. Avatar (760) vs Ne Zha (778)
4. Black Panther (700) vs The Wandering Earth (721)