As far as I know all remaining N62 4.8iS engines used in the e53's were bought by Morgan motors in the UK leaving the newer engines as the only available. I don't know about the bolt patterns but I believe the smog reduction systems don't mate up.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course