What's different between the two is that apparently China hasn't made an equivalent dent in its oil reserves, despite no significant reduction in travel, and despite reducing its import demand by 1 OPEC.
It's not entirely clear how - but theories include shifts from flights to train travel and shifts from gasoline cars to EVs.
Apparently the main reason they have started buying crude again is not for internal consumption as much as taking advantage of the massive crack spread in refined petroleum products (like diesel) which they export.