Should not be to hard.
You will definitely need the matching Ignition lock.
Wires that will need to be connected are power, accessory power, start wires.
Most of the other inputs and outputs are not an issue.
Optional would be things like boot release, flashing dash light, etc
Looks like the door locks are the same (same wiring and connectors between the EA through to ED).
Only item that may require some playing with is the interior light switch-on signal operating the interior light. This is a signal sent from SmartLock to the Central Control Module function in the ED. It should be able to be interconnected directly to the handle switches but may need to be connected via a relay.
The XR family ---->
Muzza: a XR8 AU seriesIII...bog standard :)
TBH: (the better half) drives an ED XR6 wagon (Mock Dev 4 160rwkw, JMM extractors, 4 electric windows, Ghia door panels in XR trim, rear head & arm rests in XR trim, Momo s/wheel with Cruise, EL thermos, EBGT wheels, etc) things to come soon = EECV upgrade.