Different calorie expenditure values

[klettern0]

Calories burned lower than kj output - possible?

I’m noticing for my outdoor rides on Strava that my calories burned around 200 to 300 less than total kj. Is this possible? Indoors on TR for example my calories are calculated around 1:1 with kj as expected. I’m uploading through Wahoo with a bolt. Any reason for this?

I think this Topic with the link inside covers it really well.