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Yes, there is a difference.
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The test was constructed so that the pressure differential was identical to what it would be at altitude.
Redworm,
PSI = POUNDS per SQUARE INCH.
10 psi isn't much if you're only talking about one square inch, it's a lot of you're talking about hundreds of square feet of fuselage area. For every square foot of fuselage 10psi means that there are over 1400 pounds of pressure pushing outward.