Isn’t Brozovic really similar to Xhaka ? He’s quite immobile and he’s a good passer of the ball but not too much else. I don’t think he’d be able to play with him I might be wrong.
As far as I know he's more mobile than Xhaka and he's a good tackler as well as a good passer. He's not quite world class, but he's a very good all-round CM. He's more than good enough for a club like Arsenal and I'm pretty sure he could play with Xhaka.
If there were a choice between him or Partey you'd still take Partey though. Partey is a bit younger and even more mobile. This profile explains just how good he's become:
https://www.squawka.com/en/thomas-partey-squawka-scout-atletico-madrid-analysis/