IB 5803 then IB 2376 at Barcelona
Catania → Barcelona → Valencia
Timetable, Barcelona time
20:55IB 5803 from Catania at the gatealso LL 5803, VY 6119
19:00IB 2376 to Valencia leaves the gatealso LL 3106, AY 5583, VY 5776, QR 8075
22 h 05 apart on the timetable, overnight
IB 2376 leaves 22 h 05 after IB 5803 arrives on the timetable: more than half a day, so not a connection we count.