Difference in Oticon SUMO lines

What’s the difference between the Oticon SUMO DM, XP and E? I see all three models and from a consumer viewpoint and spec’s they all appear about the same.

dm = digital 8 channels with Nr
xp = analogue super powr instrument
E analogue super power instrument

I see. Thank you. Although programmable, the XP and E are analog. The info I had doesn’t specifically point that out. I guess I just assumed that programmable aids were digital.
Mike