I apologize if this has been asked before and I couldn't find the thread.
Basically, with the new errata for the clarification of an "instance" of damage, I was looking at what can make benefit of these changes. I came across the wording of "extra damage" from Magus arcane stance and "additional damage" from Inventor overdrive and Barbarian rage. What is the difference between these things? It's very clearly not dependent on damage type, as Instincts and failure on Overdrive change damage type while still saying "additional damage". Basically, I'm asking if these things count as their own instances of damage or if they getting bundled up in some way.
