Aerodynamics is different. Reynolds number vary so much with scale that we have to adjust for it in wind tunnel models, as the results would not readily transpose.
Then there is the size factor.
Make your model plane 10 times smaller than the full size aircraft, and the mass (if proportional) is dropped by a factor of 1000 and the wing area by a factor of 100, so proportionally, you have an excess of lift for a given speed.
So you would fly slower, but that ALSO changes the Reynolds number, in the same direction that the smaller scale did.