If you used a listbox from the Forms toolbar, you can assign the same macro to
each listbox.

If you used a listbox from the control toolbox toolbar, each listbox will have
its own event.  But each of those events could call a common procedure.

Just pass it whatever you need.

Option Explicit
Private Sub ListBox1_Click()
   Call CommonProc(Me.ListBox1)
End Sub
Private Sub ListBox2_Click()
   Call CommonProc(Me.ListBox2)
End Sub
Sub CommonProc(myLB As msforms.ListBox)    
   MsgBox myLB.ListIndex    
End Sub