From what I have read, the RFI itself and some rumors from Ohakea ,your thoughts that "like for like" may a have been jettisoned is very possible or at least modified, hopefully just to be of a aircraft to carry out a similar task .
Just some idle thoughts....
I'd like to think some common sense is likely to come into play and a pure 'like-for-like' option per se isn't what eventuates. But just how closely is Govt likely to listen to the various arguments for the various platforms?
Clearly from the RFI they appear very keen on the VIP / PAX aspect for the strategic option and after they got a little embarrassed with the B757 issues on the way to India they probably realise a single one of type may not be ideal... so then do they also in addition get a larger heavy-lift type (A400; C2; 2nd hand C17)... can't see Gov agreeing to what would effectively be 4 strategic a/c.
That brings me to my next 'devils advocate' question... we here all understand the need for a heavy-lifter with better range & cargo dimensions, but will the Govt be convinced the need is there? RNZAF has managed reasonably comfortably without a heavy-lifter for a long time and would they be likely to drop that if a choice had to be made!?!
There seemed to be plenty of interest when the C17 was being looked at, but it wasn't pursued and I wonder how much of that might have been doubts over the true need for it. Now I put my hand-up right here & now stating that I certainly do NOT think the need is un-proven, but I'm trying to think of how the Govt might see this... they wear a different set of rose-tinted glasses to anyone on this forum.