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They read from different points, so they would be different.
That said, go with coretemp or which ever is higher to be safe.
coretemp reads 49C for each core idle
What about load ?
Also, What speed and vcore is that at, along with the heatsink and fan you are using.
You can use Prime95 (just google it and download it) to load your cores.
let's us know what the temps read after about 10mins, using coretemp and uGuru