3rd Gen Hemi - gearbox conversions?

from what i read,,the new challenger and camaro are going to use the same 6 speed gear box,, with all the same parts,, at least thats what i was told by some one dealing in the tremec market,,,they are trying to make it all interchange,, and it would make it cheaper for both GM and mopar to manufracture,,these cars with a manual box,,,tremec is currently the easest way to put a manual box if you want a 6 speed in your A body with a modern hemi,,or use a mopar 4 speed