Splitting hairs!
1) Mainly a space issue. 4000 - ~6500rpm is what I can reproduce effectively mid day where I am.
2) The boost varies in both: they both fluctuate slightly from ~14.9 - ~15.3. Yes I was attempting to keep the variables as close to the same as I can... same road, etc.
The point was to demonstrate timing changes based on ign. correction adjustments.... which this demonstrates.
I'm almost surprised you haven't asked about light-weight mods such as taking a big shit before the run to reduce weight by 2lbs, which could potentially change overall timing
The answer to that variable is in fact no, no JDM shats.