NBT retrofit F10 1/2012

Hi. 
Im omw to retrofit NBT into a F10 from 1/2012 and on a F11 from 3/2012. How much does this retrofit differ from F20/F30?

I need to clear up if i need to replace ZGW or not as i am reading tons of different things everywhere. It has retrofitted 606 already. 

Does anyone know this? 

I am also doing 6WB retrofit also at the same time in the one from 1/2012. 

Thanks!