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Not true these days ... if booked recently then the "Most Significant Carrier" rule applies. Do a search on AFF for either that phrase or "MSC".If this is all on a single booking/ticket, the most favourable baggage allowance applies. Regardless, your baggage allowance is on your e-ticket then add your status extras.
Codeshare = same as QF allowance, although the return carrier checkin staff sometimes need a gentle reminder...