I just installed 225/65/17 ws90's on factory 2019 17 inch rims on my 2019 Denalli. They are quite smooth and are really what should have come with the Denalli model in the first place. They are smoth and when driving over really bad roads you know the road is bad but the ride is really smooth. I am running 38 pounds of air in the tires.
As for difference in size they are .7% bigger then the factory 235/50/19 tires that come with the car, however it corrected my speedo error which read high i.e. actual speed 50 and speedo read 51, now 50 reads 50.