i'm looking for around the 29th of October

United says the following two flights are available:

18:40 20:55 FM812
20:35 22:55 FM836

while purchasing it through the Shanghai Airlines website for the same flights:

19:10 21:20 FM812
20:20 22:20 FM836

not that i'm worried about the 30min or so difference in timing but if I go by Shanghai Airlines schedule, it would make my layover shorter to take FM812. But since United is showing FM812 as departing 18:40, that makes it an illegal connection at 55 minutes. But going by Shanghai Airline's time, FM812 at 19:10 seems to be a legal connection, or maybe i'm wrong there .