does any1 know the differences between the adp and ahl engines?

im interested to know if i can swap the inlet manifolds over (im after a metal manifold for a specific LPG instalation)

 

Bumping this one, because the question still stands. I'm wondering about the same. I'm going to buy this timing belt kit, and can choose from AHL and ADP, with or without water pump. How do I find out which one I need?

 

neither of those engine codes are available in the U.S. where most of our members are from.