Hardware Monitor Vs. iStat  CPU Temp Readings

Hello, Can some kind person with Mac expertise ... please tell me why I get two sets of different Temp' readings from Hardware Monitor and iStat ?
For the same CPUs at the same time (generally : CPU B reads 2 Degrees C lower than CPU A)
My CPUs average when my G5 is :
Idle / light work load : 42.2 degrees C with Hardware Monitor
Idle / light work load : 47.2 degrees C with iStat
Working Heavy work load : 58.6 degrees C with Hardware Monitor
Working Heavy work load : 64.0 degrees C with iStat
My Mac interior is kept dust free & the tower is kept covered when shut down, (as its only in use for two hours per evening each day).
Which of the readings may be correct : Hardware Monitor or iStat ?
Is it possible to calibrate Hardware Monitor or iStat ?
Many thanks in advance & a lovely shiny green star awaits ...

Many thanks for your reply & Mac expertise
I always have the Activity Monitor CPU open ..
I am fascinated by the way the CPUs switch on heavy workloads .... when one CPU hits a top temp of 64 degrees C it seems to switch over to the other CPU. when the temp of the first CPU immediately drops it cuts in again !
... I am glad to hear its running rather cool (as its up on its very own desk).
I shall always go by the higher readings then !
Many thanks again

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