Sorry if I was unclear. I didn't mean "more massive" in the colloquial sense of "larger", but in the physics sense of "having greater mass". A 4 g object is twice as massive as a 2 g one.
I don't understand a word of what you mean..."massive"...???
Technically, it is not. Weight is proportional to mass, but not identical to it. Weight is force; force is mass times acceleration; weight is mass times gravitational acceleration. Gravity on Mars is about 1/4 what it is on Earth, so any object would weigh only 1/4 as much, and you could lift 4 times as much mass. But if you were pushing something sideways, you could only move about the same mass, not 4 times as much, because you would be overcoming the same inertia.
The *weight* = *mass* of the button in this case is the same thing...or is it not??
No I don't. Mass = density x volume. Change either volume or density, and you change the mass. Larger buttons of the same density are more massive. So are buttons of the same size, but made of a denser material.
"Massive"..you evidently mean 'density'...
And if the density is higher for the same size button, it has more mass.
...if the density is higher for the same mass you likely get a 'smaller' button....