346 = Airbus A340-600 = 66/C-class, 279/M-class
34D = Airbus A340-600 = 8/F-class, 60/C-class, 238/M-class
343 = Airbus A340-300 = 8/F-class, 42/C-class, 197/M-class
34V = Airbus A340-300 = 44/C-class, 222/M-class
330 = Airbus A330-300 = 8/F-class, 48/C-class, 165/M-class
These are the Airbus seating configurations we´re currently flying around with. This is the most current information I have. It might be outdated because it seems to me that the 343 version/configuration still features the old Business Class.
I´ve never heard of the codes 34P and 34Q, I´ve only seen the code 74P which is referred to as the Boeing 747-400 configuration with 16/F-class, 80/c-class, 234/M-class which is the largest Business class section offered on the 747-400. The code for 747´s with the smaller Business class would be 744.
However I don´t work in reservations, I´m a flight attendant so my info might not be totally up-to-date. 34P and 34Q might be used as codes in reservations/Amadeus etc. however I really don´t think that we have any more versions than the ones I´ve posted above... so I´m a bit confused myself.