There are , as far as i know different types of cabins in their b777
.

1. The new one you see all around internet currenly released
2. The almost new one which is similar
3. Best and beyond
4. The really old one used for leisure destinations (this one might be fully gone already , but not 100% sure)

You most likely will get type number 2 , or worst case scenario type 3 , and if you are super lucky type 1

If you wanna check and compare both b77 and a350 , you might check websites like flight report to get an idea = https://flight-report.com/en/search/...&year_max=2023