You overstate the relevance of your correction ("...rain on your parade.." oh! purrlease!!!)
Nice try, General, we all completely understand that:
The fact is they were BOTH B777's, BOTH had RR Trent engines, BOTH originated in CHINA & BOTH had long cruises at high cruising levels in extremely cold temperatures.
which are all indeed very relevant, but the fact is that the point you actually tried to make was:
Regardless of similar airframe/engine combination (my italics), the fact that leaps out at me is that both these flights originated ay (sic) Shanghai
Some leap since even a presumed Spam should know that Shanghai is not exactly a suburb of Beijing!
Now, just let the real experts get on with it
Jack
PS Congratulations on your promotion ......