You and your friend are on different journeys in ranked. Remember that your points are based on your individual MMR, which is where you sit on the ladder of ALL ranked players in Valorant.
Points are determined by 4 things:
winning/losing.
How many rounds you win/lose compared to your opponent(round differential).
If you performed above what your MMR thought you should perform(performance bonus star).
All the above point values multiplied by your convergence, which is your current rank being pulled to your MMR.
So, lets say you are Silver 1 and your friend is also Silver 1. If your MMR thinks you are Silver 3, but your friends MMR thinks he is Silver 2, then your convergence will multiply your RR gains higher then your friends. Alternatively, you could have gotten a bigger performance bonus because your performed better then expected but your friend performed as expected.
At the end of the day, you are on a different ranked journey then your friend. Also when comparing kills, know it's not always quantity of kill but quality. For example, if you kill an immortal player it would be worth more encounter MMR then a Silver player. So if you were to kill their highest MMR player, while your friend fragged out on their lowest MMR player, you would get more MMR from the match which would also help push your convergence multiplier higher.
I'm not going super in depth, I know this sounds confusing, but if you want to learn more about the system you can always check my post history or twitter(I try to put out a ranked fact every friday!). I hope this helps! Good luck in the last week of the Episode!