My understanding that most xenon headlights can be easily adjusted to suit either LHD or RHD - usually some sort of mechanical adjustment.
In fact with some current Audi models (S5 being one) it is possible to do it from within the car using the MMI system.
However regardless of this there should be a means of adjusting at the headlight as IIRC it is the position of the shutter that determines light spread.
The factory will I imagine provide the definitive answer.
