As a senior consultant in a fast growing tier 2 firm, I have been giving final rounds for the past year now directly discussing with senior partners regarding hiring decisions
In my experience, rarely do interviewers communicate between interviews simply because there is no time, you basicaly go from one room to the next and they dont leave the room.
Still 3 things can happen:
(1) Prior to the interview we align on certain points (e.g. this partner will have the role of testing is quant skills; OR I will understand is deeper motivation for company etc).
(2) During a break I will quickly say I have asked you about leadership so my colleague should ask about teamwork
(3) Information from your first round will be taken to the next round and we will be testing specific points we were not so sure about (e.g. structuring)
Hope this helps!