You would probably need to keep separate equipment for sour beers. I have a friend that brews clean and sour beers, but doesn't keep separate equipment. He uses bleach to sterilize and hasn't had a cross contamination yet. However, I don't recommend that. Bleach that isn't rinsed off well enough will ruin a batch just as quickly as a sour beer can ruin a clean batch.
If it's plastic, don't share. If it's metal or glass, you can share. Just clean and sanitize really well after using it and before using it again.
So the list is....
Share glass carboys, stainless carboy and kegs.
Don't share plastics of any kind or gaskets or o-rings.
For your kegator beer supply line, have a separate line between your shank and keg, that you can pop off and exchange out. Just have a dedicated beer supply line.