Hi ajpartanen,
I ran your question by coach Pedro Carvalho. Here is his reply:
Most likely its not correct , but one of the reasons it can give differently and higher is because skiing is a sport without no impact, and your weight has not so much impact. To be sure, it would be a good idea to redo the test for skiing.
Another important thing to remember is that each sport has its specificity — i.e. we should only compare apples with apples, and not compare numbers from one sport with numbers from another sport.
Does that help?
Jane