"CPU (Tctl/Tdie) in HWiNFO should be the immediate hottest temperature in the entire CPU package, while the CCD (CPU (Tdie)) value covers only the CPU cores of a given Core Complex Die (CCD). Based on our measurements, the CCD value should be closer to AMD Ryzen Master reported temperature. "
I think, in general, it's best to just consider whatever is being reported as 'temperature' as just an indicator of level of thermal output of the processor and not really a 'temperature'. I wouldn't consider it an accurate 'temperature' reading at any rate. But it's still useful for the purpose for which it's intended... to throttle fans up and down in response to processor heat production.
Curiously, CPU (Tdie) reading seems to be removed from my latest HWInfo.
EDIT add: I had to reset sensor layout in the HWInfo sensor screens to redisplay 'lost' sensors after upgrading. So CPU (Tdie) is still being reported!