The reason why I had a moment of doubt is because I found a data sheet on the grease recommended by Nissan. In the work shop manual it recommends MIL G2108 or 10924. In the data sheet that I found its visual description was Black, which got me to thinking it might be Moly Grease. But I had been using EP2 on other things so had a moment of doubt as to whether I was using the right thing. Interestingly after striping down the front hubs over the weekend the inner bearings definitely seem to have been greased with a black grease in the past. Despite very little wear I've decided to replace them anyway, good old Rock Auto.
I did strip down some spare hubs that I got for a project that I'm umming and arring over and the grease in them was bright vivid green, no idea what that was.
Thanks for all the help anyway!!