I don't believe ccq or mff applies to B777 and B74-8. It will be a short course to convert but I have it on good authority that Boeing chose not to make the two fleets compatible because most of their potential buyers would be B747-400 operators and would prefer the ability to cross qualify crews between the two types.
It is also my understanding that a final decision on who will fly the freighters has not been made yet. They are probably waiting for a decision on the B74-8 pax version.