that's easy enough to figure out. See if you can find the weather for the time that you did the dyno run (time and date). If the ambient air temp was higher than about 85deg, or barometric pressure was way way low and humidity very high, then you could actually be making a very differnt number.
SAE corrections are there to bring all the atmospheric factors to an even playing field. SAE allows hippies in a park in Boulder, CO on a 50deg day to turn in results that are actually relevant to the results that I might put down at 45 feet above sea level on a 100deg day. With std ratings you are usually pretty close to SAE if the temperature, pressure, humidity and altitude are all reasonable. Since you did your run at night, I'd call it about even unless it was really hot. Some people don't like SAE corrections because it makes them feel bad when they dyno on a cold day during high barometric pressure & low humidity.
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