Could you say that passive-aggressive and sarcasm are the same?

See here for this question’s origin.

I think there is a difference. Sarcasm is intentionally bringing shame on an offender by ridiculing him/her. Target knows who flung the arrow.

Passive-aggression is acting like it’s all cool, in person, then leaving a note/email sounding all sunny-like (often directed at the entire group, when meaning to hit one person), while shooting daggers.

So. Sarcasm is directed at the target. Passive aggression is a direct attack that could be interpreted as a general statement if the attacker were challenged?