Correct; the 330 to 340 conversion was a CCQ, resulting in 'MFF'. On our licence pages, it was annotated as 'A330,A340' (note the comma). On the other hand, 330 to 350 is a differences course, resulting in 'A330/A350' on the licence (slash, not comma!), leading to 'SFF'. The regulator still requires extra training; paradoxically, a common type rating doesn't equal 'no extra training'. Our particular differences course goes beyond the minimum required by the regulator. Again, from memory, we do 2 x sims more than the minimum required by the HK CAD, plus the 2 x OBS sectors.