FR 9481 then OS 823 at Vienna
Cologne → Vienna → Thessaloniki
Timetable, Vienna time
22:10FR 9481 from Cologne at the gate
12:30OS 823 to Thessaloniki leaves the gate
14 h 20 apart on the timetable, overnight
OS 823 leaves 14 h 20 after FR 9481 arrives on the timetable: more than half a day, so not a connection we count.