Apart from throttle response, cupra makes no difference to the engine bar the sound actuator
According to the SEAT manual
Engine
Depending on the profile selected, the engine responds more spontaneously or more in harmony with the movements of the accelerator.
Additionally, when Eco mode is selected, the
Start-stop function is automatically activated.
In vehicles with automatic
transmission, the gear change points are modified to position them in lower or higher engine speed ranges.
Additionally, the Eco1) mode activates the Inertia function, enabling consumption to be further reduced.
In manual gearbox vehicles, Eco1) mode causes the gear change recommendation indications that appear on the instrument panel to
vary, facilitating more efficient driving.
Dynamic chassis control (DCC)
DCC continuously adapts the shock absorbers to the condition of the road and current driving conditions, according to the pre-set
programme.
Power Steering
Becomes more robust in Sport mode to enable a sportier driving style. In the Leon Cupra the power steering becomes
more robust in Cupra mode.
Air conditioning
In vehicles with Climatronic, this can operate
in eco1) mode, especially restricting fuel consumption.
So yes it does only change the the throttle response but in turn for most users this means the car feels more powerful / responsive / aggressive etc. And lets face it most users turn off the structure-borne noise actuator: