EI 991 then EI 3408 at Dublin
Rome → Dublin → Donegal
Timetable, Dublin time
02:00EI 991 from Rome at the gate
18:50EI 3408 to Donegal leaves the gate
16 h 50 apart on the timetable
EI 3408 leaves 16 h 50 after EI 991 arrives on the timetable: more than half a day, so not a connection we count.