Concerning COC /CABIN, Pack1/Pack2.
There may be a different situation concerning smoke. Not only smoke out of the avionic compartment, but due to different installation of ducts etc.
I remember a cold winter day on 727 when soon after takeoff with wing AI ON the cabin was filled with white "smoke". Immediate call of the FA in the back. Smoke was so dense you couldn't see them from the cockpit.
Reason: wing anti ice turns on with air/grd sensor. Some gallons of water/coffe whatever fluid splashed out of the cabin floor on the wing anti ice ducts. A hose of the galley was disconnected and so the fluids accumulated.
In the Cockpit and fwd cabin the air was clear.