Someone will see this that knows. I personally know nothing about NANOCOM stuff. Sometimes it will take a day Or two
I'm pretty sure that the ecu tune would just make up for that extra 6 tenths of a liter.
Biggest problem I've seen guys have after swapping out to a 4.6 is the mass air sensor is different. I don't spend much time with Disco2s anymore, but I think the whole airbox lid and fresh air inlet is larger diameter on the 4.6.