is there any difference between the g and the h version
I suspect the H will be the latest revision!
If you have never taken that pipe off you are in for treat btw. It is the worst offending piece of car part I have come across when it comes to taking off and putting on. I used a reatract hose clamp plier and even then it was not easy!
EDIT - just noticed some revisions have a recirc pipe for DVs on later engines. My AXX engine does not have this as the DV is located near the bottom of the engine!