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 ...
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