One is an economic plan that went wrong due to various factors including really bad weather that was unusually bad by chance. Take that away and maybe the thing might have not happened, def not the same extent.Another version of the Japanese's excuse:
"Japan killed more than 30 million Chinese during World War II, and Japan should be condemned."
"The CPC famine killed 100 million people, why don't you blame the CPC?"
The other is deliberate killing without where nothing would change since it was dependent on intent.
Its not really hard to see.
Btw I find it funny how I have not seen a single US/UK person ever mention they deliberately sanctioned China during famine with the intent of killing more people. That is not random and will not go away.