There is no 9–6 overlap. Stretching to 07:00–21:00 on both sides gives you 07:00–11:15 Santiago time:
07:00 you → 16:45 Kathmandu
08:00 you → 17:45 Kathmandu
09:00 you → 18:45 Kathmandu
09:00→18:45outside Kathmandu working hours
10:00→19:45outside Kathmandu working hours
11:00→20:45outside Kathmandu working hours
12:00→21:45outside Kathmandu working hours
13:00→22:45outside Kathmandu working hours
14:00→23:45outside Kathmandu working hours
15:00→00:45next day · outside Kathmandu working hours
16:00→01:45next day · outside Kathmandu working hours
17:00→02:45next day · outside Kathmandu working hours
Working hours assumed 09:00–18:00 local. Offsets include daylight saving where it applies, so this shifts through the year.