YES! I noticed this a few weeks ago, literally, and until then I thought LRM looked cooler than the other A350s but I couldn't put my finger on why it was. My friend called me crazy when I told him that LRM's mask looked different! LRM was not delivered like this, but it seems that this happened when it went for a D-check in 2021 or 2022, I can't remember. I really don't know why it's like that, but in my opinion it looks cooler than the standard mask, CX should introduce this on some more A350s.
I sent this to my friend last week lol, you can see the date at the top of the screenshot