No idea about the Sprinter, but about the VW LT I know, that the model-code and chassis-code depends on the body/chassis, not just on the engine. So there were different chassis-codes for complete bodied vehicles and plain chassis with just the driver-cab. And for the versions with plain chassis there were more differences, depending, where the VW-made body ends
- plain chassis with engine
- with grille and headlights
- with engine hood
- with frontscreen
- with frontscreen, roof and front doors
- with complete cab with open back
- with complete, closed cab
...


The Sprinter on your pic was in its first life a parcel-transporter of the Deutsche Post, the German postal service, clearly identifyable by the colour.
The bodywork is not made by Mercedes Benz, AFAIK it's from the company Kögel from Ulm.
I don't know, how the basis chassis were delivered by Mercedes Benz to Kögel, I suppose as chassis with doors, frontscreen, but without roof and with open back.