Your google screensaver doesn't come with Windows 10. So you would have to download and install it, just like you did on the previous install of Windows 10.
My PC had to have Windows 10 reinstalled and when it did the google collage screen saver option was not listed under possible screensavers. It may have been called google photos but I've tried looking and can't find it. It lets you select photos and randomly throws them onto the screen at time increments of your choosing.