FR 658 then FR 1958 at Dublin
Brussels → Dublin → Nice
Timetable, Dublin time
19:20FR 658 from Brussels at the gate
16:40FR 1958 to Nice leaves the gate
21 h 20 apart on the timetable, overnight
FR 1958 leaves 21 h 20 after FR 658 arrives on the timetable: more than half a day, so not a connection we count.