IB 5803 then IB 5376 at Barcelona
Catania → Barcelona → Firenze
Timetable, Barcelona time
20:55IB 5803 from Catania at the gatealso LL 5803, VY 6119
18:45IB 5376 to Firenze leaves the gatealso LL 5376, VY 6076
21 h 50 apart on the timetable, overnight
IB 5376 leaves 21 h 50 after IB 5803 arrives on the timetable: more than half a day, so not a connection we count.