The engine swap was done in 2006 so as I said you could be either. If you took any pics of it then look at a pic of the drivers door as there will be a big sticker on the door.
You may well not tell the difference between stock and GVM Upgrade suspension especially if your fairly new to Patrols.
Climb under the back and see if the rear spring towers have any form of bracing.
It has averaged 8,800kms per year which is actually pretty viable for a small coastal precinct I reckon.