Dang, it's a lot easier being an expert when nobody gets specific. I don't really know. This article about the MAB C & D
http://unblinkingeye.com/Guns/MABC/mabc.html
doesn't mention any major design changes that would require a different magazine, but it is not all that detailed. Offhand, I would not think there was any difference, but it's not my money at risk. Does Triple K list two different magazines for the MAB D?