I recently upgraded from a 3700X to a 5900X and am noticing a difference in CPU temps between what CAM is reporting and Ryzen Master. There is almost always at a minimum a 8-10 degree difference with temps in Ryzen Master being lower than what CAM reports. During temp spikes the delta grows even more.
I noticed something similar when I first got the 3700X but seemingly had been fixed over time as CAM/Ryzen Master seemed to be much closer in temps.
Most regard Ryzen Master as the most accurate measure for Ryzen processors and makes sense to cool based off of that.