These character-level parallels are actually really good observations.
Diana seems a little less aloof than Weiss, though.
Other pairings fitting the enthusiastic/reserved trope are Anna/Elsa and Korra/Asami.
I recognized Itou Hachi's art style right away, but not the characters (despite reading the manga). lol
Saki and Miyoko look unrecognizable in Hachi's art style. xD
It always feels so weird to see them referring to each other by their personal names, since through the majority of the manga they're barely acknowledged.