When you manually log a workout after the fact, fitbit disregards all the data, including heart rate, that was actually recorded, and just goes by the parameters you chose when logging the workout. I guess the original assumption is that the reason you are manually logging it after the fact is because you wee not wearing your tracker during the workout. So if entered the same parameters, say 1 hour workout with the same intensity, it would calculate the same calories, though I guess the parameters input vary with type workout selected.
What confuses me a bit in this case is seeing the different heart rates and zones. Perhaps that is because I am used to seeing the workout summaries from tapping days of exercise tile, which I think is same as you would see tapping right arrow at right end of both workout summaries. I expect, though not sure and would be curious to hear, there you would see both workouts looking same. I gather screenshot you posted was from tapping Zone Minutes. Maybe Zone Minutes at least looks at heart rate but does not actually use it for calorie calculation.
That must have sounded very confusing.
But the way I recommend for more accurate results instead of manually logging workouts, is to use the Exercise App on the device. Scroll left or right until you get to the Exercise App; choose which exercise category you want, then Start, then Stop when Done, and it is recorded. There is nothing else needs done after-the-fact. And it uses all the data including heart rate that was recorded so you don't tell it how hard you worked or how long or any of that.
I personally cringe whenever I read of people manually recording workouts instead of using the Exercise App. Except for some activities that do well by auto-recognition, such as walks.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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