Fitbit Calorie Syncing Help

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Hi- I am hoping for clarity on this issue. I currently use my Fitbit a Flex and I use a hear rate monitor when exercising. I always replace my Fitbit times on myfitnesspal and replace the calories burned. BUT my question is this- I understand that my logging of accurate calorie burns updates myfitnesspal, but does it update the Fitbit site. In other words, when I log the accurate calories in myfitnesspal does it change my total calories burned on Fitbit?

Thanks

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