Not sure if there is a difference other than the MAP sensor, but in my '95 PCV setup, there is a small o-ring on the bottom of the valve that sometimes gets stuck in the hole, and there is a big o-ring on the cover. You need both to get a good seal. And, although the older L27s used a spring on the PCV, I do not think the Series II L36 does. At least mine doesn't, and the FSM doesn't show one. Of course, the FSM also does not show the big top o-ring that IS supposed to be there.
We really need someone with a MAP sensor to help out here.