Open Safari and type the printer IP address in the Address bar
If the Webpage that loads says Centreware Internet services it is the built in controller
If it has the EFI logo its the Fiery
What model controller do you have with that device? Because only one is compatible with Mojave and the other is not.
Howewer, in 7425 driver download page there is no driver for Mojave.
High Sierra driver (XeroxPrintDriver_4.14.0_1947) does not work (can't proceed in installer)
XeroxPrintDriver_5.2.0_2115 does not have driver for WorkCentre 7425.
Apple AirPrint & IPP recognize 7425 (driver version 3.123.0), show supply levels etc, but cannot print ("You need to install software to use this printer").
How to get it working?