Accuracy of measured calories during a workout

I recently played a soccer game and selected a soccer game activity on my watch, after ±60 min of play my active calories were more or less 860 and average HR 174, a few days later I played again but selected an outdoor run instead as I also wanted to measure my distance covered. However, this time after approximately the same time of play (±60min) my active calories were 460 and average HR was 177.

Can someone explain why such a big difference between both days occured?