A.pSeries eWLM can create classes while pSeries WLM can create tiers.
B.pSeries eWLM can create tiers while pSeries WLM can create classes.
C.pSeries eWLM is implemented over multiple O/S images while pSeries WLM is implemented within an individual O/S image.
D.pSeries eWLM is implemented within an individual O/S image while pSeries WLM is implemented over multiple O/S images.