NNBS Mcgaughy helper bag problem

I believe all nnbs (2 and 4WD) sit at the same height. I know the nbs was a big difference between 2 and 4WD height.
 
All nnbs whether 2 or 4wd sit the same but when lowering 4/6 it doesnt matter because you get rid of the block when doing the flip anyway
For instance nbs z71 trucks have a 2" block where 2wd dont, when you install a flip kit you remove the block when you relocate the axle to the topside of the leaf springs so both truck will sit the same