Apple watch calories calculation

I have been cross country skiing and am wondering how the calories calculations work with the workout app. I first tried the cross country ski workout but it did not map my route (how to do that with the cross country skiing is also a question) so the second time I went out I tried the outdoor run workout. The calorie calculation doing the exact same thing is vastly different using the different workout apps. They are listed below:

Cross country skiing while selecting the workout activity to track:

Selecting the Cross Country Skiing workout - 698 active calories per hour

Selecting the Outdoor run workout - 224 active calories per hour

How can doing the same thing have such different calorie calculations depending on what activity I select to track it with?