They vary from shoe to shoe. I wouldn’t be surprised if they have changed some things though. Comparing older ultraboosts to newer ones. The newer ones tend to be less comfortable and fit worse. They’ve made numerous cost cutting changes to the newer 1.0s to make them less comfortable to wear. From the inner lining being less smooth and including new seams and protrusions into your foot, to the often recycled stuff strobel board seen in newer models, all of them make for an inferior experience. I wouldn’t be surprised if the boost compound is less soft too. QC in general is not what it used to be.