They're usually just general manuals for all the K11, even the haynes manuals have quite a wide range of car years that they cover. Not a lot of time is spent by manufacturers writing documentation for their products
When the manufacturer updated the car, like the facelift k11 with the coilpack, they likely just distributed a service manual to their dealerships so they they could still service them
You could email Nissan and see if they would send you one if they have one to hand?