Round 3 Survivors * Spoiler*

In a Q&A for S2 Amotti said they film games 2-3 weeks apart from each other… there is a series of IG posts made by Japans Judo & Austrlais strongman at a hotel and out of 20+ photos only 4 team members are featured (Aus,Kor,Jap,Mong).

Therefore I think it can be assumed these are the 4 surviving teams and those photos were taken when filming the next round. Otherwise photos of other team members would be present.