If you are trying to restore data from an iPhone 8 that is on iOS 12.3.2 to a new iPhone XR that is only on iOS 12.3.1, you will need to makes some changes. The best thing to do is to do a short search here on the forum for another thread with iOS 12.3.2, iPhone 8, and restore in it. You will find a few of them, and most of them have a workaround. What you have to do is to create an iTunes backup, then locate the backup on your computer and use a text editor to modify the file. The instructions are long, and I don't have them all written down, and it would be easier for you to search. You shouldn't have any troubles find one or two that contain those instructions.