That percentage will depend heavily on the show. The Big Bang Theory is fairly innocuous. Imagine trying to censor dramas like Game of Thrones, Breaking Bad, or House of Cards to remove all of the depictions of sex, drugs, or political commentary.
One is a private company (either first or third-party) offering a censored version of a piece of media and the other is the government redacting things from a document that would normally not be released at all (at this stage) and the redactions were specifically done to prevent witnesses tampering or similar tactics by the accused.
To call those "similar" is just absurd.