Re: the six A340-300’s in question. Boeing is offering extremely sweet deals to get shot of the ex-SQ machines they have recently been landed with, in part-ex for B777’s supplied to SQ as part of “the deal of the century”. So even though they may not currently match the EK A330 spec, there are powerful incentives for even more Boeing money to be spent and the aircraft being brought up to the required mod state for EK acceptance. The alternative being that they remain grounded and "eating up money" in vast quantities on a daily basis.
Behind the scenes, the Seattle manufacturer is desperate to unload and seething that they continue making SQ bound B777’s “for the fun of it”.
Therefore, whilst nothing in life is certain, the smart money is on the machines appearing on the Dubai flight line in fairly short order, rapidly followed by extra crews to fly them.