I remember way back in 2015, commanders had specific voice lines in which they would react based on the hero you were allied with. My memory is foggy, but some rough examples:
Swann allied with Zagara.
“Ugh okay, but just don’t get creep on my tech”
Raynor with Swann
He mentions something about being good buddies.
It was a long time ago so I barely remember the others, but I know they existed at one point.