That's cool Rob, I didn't read it as being critical. I don't know about the others but I'm pretty sure Carrillo still make their own forgings at their base in the US - that's what their website still states and I can't see them changing.
TBH I expect all of these rods would be fine. You don't exactly hear of people breaking the stock ones, never mind any forged aftermarket ones. I also have no doubt the Carrillos are better quality, you just need to hold one in your hand, they are lovely. But it probably makes no difference in reality.
I very much doubt you'd see any difference in power band etc. The benefit of lower mass rods is more the reduction in load where the piston changes direction so reliability basically. I don't think anyone would set their rev limits so close to the edge as to show up any difference. There are so many variables with specs you're never going to be able to compare just something like rods anyway.