Usually it's a boundary setting or reporting issue.
Sketch out the layers of boundaries (hot bit, casing coil etc) as a list & link where the two models are common. Check what thermal load is then applied: ie W/m3/s or W/m2 etc and then look to see if the flux in the model ties up with what you expect. For a steady system Watt (I like bad puns) goes in must come out, so also check where heat leaves the system.
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