Asiana has 3 747-combi and 2 747-pax planes. Out of 3 combi's, one is dark bird to be left soon, and other 2 combi's as well as pax versions are fully new configuration.
That dark one usually runs on HKG, and will be substituted by 777 and 333 mostly, and 1 weekly 747-combi in May. So essentially you don't worry to meet that plane.