I seperated them by adding the following line to my uBO filters:

  news.ycombinator.com##.votearrow:style(margin-bottom:12px !important;)

I've also added the following lines to highlight comments that I've upvoted or downvoted to make it easier to see:

  news.ycombinator.com##a[id^="un"]:has-text(unvote):upward(4):style(border-left: 1ch solid green !important; padding-left: 1ch !important;)
  news.ycombinator.com##a[id^="un"]:has-text(undown):upward(4):style(border-left: 1ch dotted red !important; padding-left: 1ch !important;)