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May have already happened.
https://www.aljazeera.com/amp/news/longform/2023/4/14/how-india-will-overtake-china-to-become-the-most-populous-country
Quite an interesting article and interactive graphics.
(Amazing that Bangledesh will have more than 200MM people with a size of about Illinois.)
After the coming war, Chicago's population will overtake China's.