Condor is a subsidiary of the LUFTHANSA Group. Lufthansa is not turning into a Airbus Fleet Airline. It´s a only a question which plane fits to the requirements Lufthansa have. Lufthansa CityLine uses also RJ85 and Canadair Jets for short european destinations.
Condor uses Boeings and give there DC-10 all away, only one is left for now. They are launch customer for the streched 757.
Condor is free in their decisions, but they go with the Group of course. Thinking about maintenance and stuff.