These brakes came on all 2019 and up silverado tahoe, suburban escalade yukons, its a standard replacement for the old 2 piston floating caliper set up. The rotor goes from 330mm to 350mm so that helps some. The caliper itself has 4 pistons so more even pressure across both pads and these should work better on your 2015.
On my truck given that it had already new pads and rotors, the breaking was always lacking and left a lot to be desired. Pedal was soft and mushy with no real confidence feel.
WIth the new brakes it now feels more firm and has a hard stop point where the brakes start to really grab and it allows you to bring the heavy vehicle to a stop with high confidence. I think this is 100% must upgrade given you can find these for dirt cheap. My set up was 150$ came off a new escalade with only 4mi on the odometer. I got rotors, pads and calipers in that package deal. Hunt market place for these, they do show up from time to time as dealers are doing factory brake upgrades on some of the new models and they simply throw these in the trash. Some mechanics will save these parts and resell them.