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Ovens may use different thermostats. Some may pre-heat past 400 by 25 degrees on initial heat up by design to compensate for heat loss. Or a door opening to add food. Some brands heat to precisely 400. If you put a manual thermometer in and read it after it gets to temp on the panel, that will tell you a lot. Rack placement, insulation, and convection fan power are some variables too. But it is very possible to cook slightly differently in 2 ovens at the same temp. Always good to hang a thermometer on the rack you can read through the window to check the exact internal temp.
