Beags,
Indeed. The article does not say that the aircraft will be a KC2, in fact the 323 seat fit doesn't feature as a config for the KC2. The article, quite rightly says that the aircraft will be delivered to Bzz where it will be converted into the civilian variant. The KC2 and 3 are military versions only, the civilian variants has to hold a civ TC and hence the need for the conversion work.
The important reason for this difference is who holds responsibility for airworthiness. For the mil jet (KC2 and 3) the military TAA has responsibility. For the civil variant of FSTA the military has no airworthiness role, this is purely down to the AOC holder and the civilian authorities.