IB 5343 then IB 5376 at Barcelona
Rome → Barcelona → Firenze
Timetable, Barcelona time
19:05IB 5343 from Rome at the gatealso LL 5343
18:45IB 5376 to Firenze leaves the gatealso LL 5376, VY 6076
23 h 40 apart on the timetable, overnight
IB 5376 leaves 23 h 40 after IB 5343 arrives on the timetable: more than half a day, so not a connection we count.