Two uniform solid spheres of the same size, but different mass, are released from rest simultaneously at the same height on a hill and roll to the bottom without slipping. which will reach first?

consider a sphere with moment of inertia as
being a scalar constant

Now as it’s ideal rolling at any height h from the top of the hill if we apply energy conservation we have the following

the M cancels out and hence at any point on the hilll the velocity of the object is independent of mass
so it the time to reach bottom
Hence both will reach bottom at the same time