I agree with Mex, except one thing.
When DTX is activated, there can be difference.
But without enabling DTX, MSs can have different RxLevel also in dedicated mode when PC is enabled.
DTX-it is not a changeable feature, you can enable or disable. It is used only in silent call (uplink or downlink).
PC-there are many parameters in PC to change. PC is used according to RxQuality, RxLevel. And you can change their thresholds.