nice sets you got tehre. I'd even go that far and believe that the set in the first 3 pictures is deemed the 'snipers' version of the smock and the pants. The indicator and trigger for this assumption are the additional loops on the smock.
Just one other thing, although DSO translates to Division Special Operations, it is more or less the specialized division for units which are airmobile like Fallschirmjäger, Fernspaeher (Long Range Reconaissance), Luftlandefernmeldebatallion DSO (Airborne Signal Bn DSO) and of course also the guys from KSK (Kommando Spezial Kraefte - German Special Forces).
The Division is fairly new (April 1st 2001) as it was formed from the former Kommando Luftbewegliche Kraefte / 4. Division (Airmobile Forces Command).