clutch 9 inch vs 11 inch

[pooch]

Have what I think is A 37 truck motor.

It has an 11 inch clutch, fitting a 39 toploader to it for a fenderless hiboy roadster .

Obviusly I do not need the truck clutch for such a light car, but if I leave it, are they are harder to push the pedal, or any other reason to fit a car 9 inch clutch ?

If it is no difference I will leave it as to save changing the flywheel.