difference between PD150 and vr6 airbox

I am going to put my DSG snorkel on soon and want to leave my stock air box un-cut so I will need another air box. What is the differences between the pd150 air box , the vr6 air box and the r32 DSG air box.
I know the bottom of the DSG is the one that fits the snorkel. But what are the other differences?

the whole of the airbox range all use the same lower half anyway(apart from R32 DSG) so if you just want one to cut up just get an ALH one