TG 619 then KR 704 at Bangkok
Chengdu → Bangkok → Phnom Penh
Timetable, Bangkok time
17:20TG 619 from Chengdu at the gate
16:20KR 704 to Phnom Penh leaves the gate
23 h apart on the timetable, overnight
KR 704 leaves 23 h after TG 619 arrives on the timetable: more than half a day, so not a connection we count.