MyZone belt & Apple Watch

Hi there,

I have a MyZone HR belt and an Apple Watch for my workouts. I wear them both whilst training and once my workout is completed, I have two different sets of data (MyZone traditionally being higher in calories burned). Will this affect the overall total of my calories burnt, IE will it use both and add them together or use them both and find an average? I wouldn’t want to be doubling my calories burned for one workout as that’s cheating haha.

Does anyone have any ideas on this? Many thanks in advance!