I think it was both the D.III and D.V. There have been others as well, Bf 108 and Albatros L29 are 2 that I know of. It is simply a way of selling more kits of the same, original sprues.
Not bad, just business. But not nice if you are looking for that one set of decals.
Maybe the decals can be found elsewhere? or maybe a member has the Profipack version which has all the decal options I think and is willing to trade a set?