Not enough data to determine. ECUs work off lots of input parameters and make corrections based on IAT (intake air temp), ECT (Engine Coolant Temp), knock sensors, etc. All kinds of things could be going on there, and w/o readings on those variables, you'll never know.
That's why it is critical to be as consistent as possible when dyno testing parts. In fact, using an A-B-A approach on the same day using the same procedure is best, but it gets expensive and logistically challenging. I do a lot of dyno testing and have learned that every motor is a little different in what affects it. For my Civic, I had to do pairs of runs, as the first was always worse then the next one immediately following. On my track car (K24 motor), I only need to do single pulls so long as I keep the IAT and ECT consistent (big fans, FTW).
