The 100 pads do fit, although can be a bit snug if fitting with new disks and including the anti sqeal shims behind the pads.
The theory is that the pads provide a wider area of friction material on the disk although going back to basic physics the larger pads will result in less pressure on the disk to a bit of a negative there.
With all things being equal I suspect that you won't notice a missive difference fitting them, although if the rest of the braking system is in tip top condition it would be a worth while next step.