Thanks holdmetight!
Correct me if I am wrong on this:
B744 SOs upgrade to B772, B773, B773ER via the Cross Crew Qualification course
B77(2,3,3ER) upgrade to B77(2,3,3ER)
A343 SOs upgrade to A333 also via Cross Crew Qualification course or stay on A343
A333 SOs stay on the A333
Anyone please feel free to add onto this or correct.