[ERA Chas]

You will surely get a different set of numbers-close but slightly different. If vastly different then someone is fudging.
Dynos are best tools for comparison tests of components or tuning adjustments in a build.
Then you can see what % of change the mods or adjustments make.
Unless you're tracking the car and need definitive numbers, save your money on a second dyno run. For a street car, your current dyno numbers are representative that you'll have a strong-running street car.