OS 768 then FR 9480 at Vienna
Varna → Vienna → Cologne
Timetable, Vienna time
14:10OS 768 from Varna at the gate
07:55FR 9480 to Cologne leaves the gate
17 h 45 apart on the timetable, overnight
FR 9480 leaves 17 h 45 after OS 768 arrives on the timetable: more than half a day, so not a connection we count.