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It is still whataboutism. Do two wrongs make a right? Does an accusation of hypocrisy nullify any original criticism, no matter how true?

No, I get what you mean, but I still think it's a different argument in nature. It's not two wrongs, it's one and the same.

For me typical fallacy would be something like

"You did A. A is bad."

"So what? You did B. B is bad."

This tries to dismiss A , while "Both did A." tells us something about A.