Same as title

I used a charger of xiaomi , which grants the 45 w super fast charging 2.0 (Gan charger 65 w) , first samsung mobile , temp MAX was 38 , most was 36 - 37 , so , is this normal for the mobile or for many people or not ?

Will try to get my hands on a 25 w charger to compare , also , does GAN chargers lower temperature of phone or are they just for chargers itself ?