The fact that Mao tried to have Deng assassinated goes to show that it became a different government when Deng ascended to power.
The fact that Xi was sent to a reeducation camp in the 70s and now he is the president of China shows this is a different government.
You can think of it as the same government, just ruled by a new set of people. It's not like there was a violent overthrow. The Party is still very much in control.
But these categorizations don't mean all that much.
The fact that Mao tried to have Deng assassinated goes to show that it became a different government when Deng ascended to power.
The fact that Xi was sent to a reeducation camp in the 70s and now he is the president of China shows this is a different government.