Your Home Screen accommodates App/folder icons and Widgets in a fixed grid layout - the number of available rows and columns being determined by the screen size.
Your iPad mini and iPad Pro have different screen sizes. The iPad mini has a smaller screen that has fewer rows/columns than your iPad Pro. As there is no direct correlation between the two devices, you'll not be able to create a 1:1 copy of your Home Screen layout - any more than this would be possible between iPad and iPhone.
As such, your only option is to manually set-up the Home Screens of your two iPads to best meet your preferences; there is no method by which to automatically replicate the layout between dissimilar devices by transferring from the iPad Pro, or restoring an iCloud or iTunes backup.