Saka is more confident in his PKs. Not as much stutter stepping which to me indicates a lack of confidence
One thing they did was clarify the rules on this before the season, which was if theres still contact being made into the box its a pen. And because the WHU defender was still on Timber when he went into the box its a pen. If Diouf stopped touching him before the pen box then its a foul outside the box.
He has been since that 2020 Euro final when he missed that penalty. Since then the technique has changed, shot placement has changed, power has changed, and now he only misses because he is putting it slightly too wide. He was still doing the stutter steps the last 2 seasons though and he wasn't missing them. Maybe him doing smaller hops now is just the next refinement in his penalty approach.