Carnival Corp.'s policy only gets you a past passenger rate, nothing else. I'm top tier on Princess and all of the bennies (comped laundry, canapes, priority tendering, etc.) don't go over to Carnival. Part of the reason for this, I think, is that Carnival's loyalty program is not tiered...nor would it be given the Arison family's original desire for egalitarianism in cruising. Carnival was originally started as "cruising for the masses" and it has not strayed from that.