OS 604 then FR 9480 at Vienna
Zagreb → Vienna → Cologne
Timetable, Vienna time
11:55OS 604 from Zagreb at the gate
07:55FR 9480 to Cologne leaves the gate
20 h apart on the timetable, overnight
FR 9480 leaves 20 h after OS 604 arrives on the timetable: more than half a day, so not a connection we count.