The show is A Fazenda, there's been as far as I can find two classic tit-to-tit confrontations between contestants on the show. First is Andreesa and Denise, this one is definitely a classic:
https://youtu.be/Ua0V781zQFA?si=Hpa9TkOobZfNz7nD (starts around 4:20)
The other is between Deborah and Deolane:
https://www.youtube.com/watch?v=ml-7D_t1Dqk (starts around 2:10)
Not sure if there's more since most videos are in Portuguese (I also wish I knew what they were saying), but if anyone finds any feel free to put them here.
The first one is an absolute classic, they actually had a separate confrontation earlier in the show, here
https://www.youtube.com/watch?v=5r0CNsJPC4sIf you look around 2:36, they make tits on tits contact for the first time, they shout at each other a bit more, and suddenly one realizes the boob on boob contact and backs off. But then they keep fights and around 5:20 one of them spits on the other and they shove tits on tits for real. No wonder they fought again in the video you shared. As for what they tell each other, sadly it's not that interesting, the usual "bitch", "slut", "lesbo" type of insults, also a lot of mentions to each other's vaginas? Somehow, they eventually reconciled if anyone wants a happy ending.
I had never seen the other one, wish there were more examples of women doing this in realities, I have seen it in a British reality and in some season of a Next Top Model show but I have never been able to find them back.