I realize my post was long, but I did say this:
Now for the differences: in the previous two shootings, the killer targeted a middle-aged to older man, in both cases, alone. The killer in this case targeted a group of students, including women (the victim is a woman).
A skimask is certainly not a distinguishing factor, but a skimask shooting without an attempted robbery is at least notable. It's a similarity. You say not distinguishing, and I say it's at least notable.
Was it the same gun? We don't know. The police haven't made any comment.
Did the shooter have the same gait? We don't know. The police haven't made any comment.
There is no conclusion: my post posed a question. It's right there in the title.
For me, a murder by a guy on foot wearing a skimask and shooting people seemingly at random about 300 yards from where a guy on foot wearing a skimask randomly shot somebody in 2018 which was itself only a few blocks from where we know the same guy did the same thing the day before at least raises the question.