From the ANO Amendment 2/2009:
Commercial air transport (CAT) flight’ means a flight which is required to be operated in accordance with EU-OPS and an aircraft flies for the purpose of commercial air transport if the flight is a commercial air transport flight.
Public transport’ (PT) has the meaning assigned to it by article 260.
If a King Air is operated PT then, as per Article 45, its flight crew must consist of at least 2 pilots.
If it is operated as CAT, under EU-OPS, then all flight crew must be qualified in accordance with EU-OPS Subpart N.