Don’t call me Shirley
You’ve got me thinking now, but no.
I can pan a mono input from left to right (obviously when sending to a stereo mix).
I can pan each side of a stereo input as if it were 2 monos. In this case pans can be independent, but would more normally be linked and opposite.
I adjust the balance between the left and right side of a stereo input – but they still get sent where I’ve panned them.
If I have a stereo output, and I want the left to be louder overall, then I’d also be adjusting the balance.