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Not sure they'd be much different - have you checked the tyres aren't over-inflated? Also some brands will ride much softer than others depending on the compounds used.
18" wheels will give a better ride than 19" wheels.
Tyres do make a difference. I find Goodyear Asymmetric tyres have a softer sidewall than other tyres and give a smoother ride. I've had tyres with 92 and 96 load and the 92 load are also noticeably smoother.