找到了一个官方的link。

https://www.justice.gov/pardon/clemency-statistics

google AI 的解答。 Pardon/Clemency

Clemency:

An act of mercy by an authority figure to lessen the punishment for a crime, which can include a pardon but also includes options like reducing the sentence length. 

Pardon:

A legal act that completely forgives a crime and removes any legal consequences associated with it, essentially treating the person as innocent.