KR 703 then TG 574 at Bangkok
Phnom Penh → Bangkok → Vientiane
Timetable, Bangkok time
21:20KR 703 from Phnom Penh at the gate
18:30TG 574 to Vientiane leaves the gate
21 h 10 apart on the timetable, overnight
TG 574 leaves 21 h 10 after KR 703 arrives on the timetable: more than half a day, so not a connection we count.