Is this normal?

So me and my friend have been playing quite a bit of ranked lately Were 1 division apart (in gold 5 he's silver 1) And after every game we share our lp gain/loss when we win he gets around 14-19 where as I get 21-25 And as for losses he loses as much as 18 sometimes where as the most I've lost was 14 I usually play support for him and he played adc When the season started I skipped silver 3 after promos in silver 4 I cant seem to find an answer anywhere so thanks in advance if you can tell me why were getting such different numbers from the same games
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