I posted that earlier. But viewed this way you can see little twitches from Westbrooke that he's going to the goalie's right. Maybe Hiwula telegraphed it? Maybe the MK goalie is better?
I think Westbrooke disguised his kick better than Hiwula did, and as such the keeper was later in diving to his left than the MK keeper was. As said by others he also hit it sweeter and at a less comfortable height for a keeper to save it.