The funny thing is the hindu census 2011 was inaccurate and recent UN estimate is a few 10s of millions more. I did  a brief web search and the numbers could differ quite a bit:

(If one finds discrepency in china popn data, it has to do with whether TW,HK,Macao data are included or not)

-- India 1,326,093,247 (july 2020 est)  from 'CIA world factbook'

--1,378,167,746 'live data' from 'worldmeters' site

--1,393,633,833 'live data' from 'countrymeters' site

--From 'tradingeconomics' , less than 1.32 billion in 2020 https://tradingeconomics.com/india/population