FR 9484 then OS 649 at Vienna
Cologne → Vienna → Prague
Timetable, Vienna time
07:50FR 9484 from Cologne at the gate
21:45OS 649 to Prague leaves the gate
13 h 55 apart on the timetable
OS 649 leaves 13 h 55 after FR 9484 arrives on the timetable: more than half a day, so not a connection we count.