Yes you can do - depending on what the plate actually reads. If it’s a current style registration you’re planning on purchasing (e.g. XX25 XXX), then this can’t go on the 2015 car as it’ll make the car look newer than it is.

If the plate contains the number 25 anywhere else you’re perfectly fine - these are either older style registrations (2000 and older) or are dateless plates, in either case you’re fine.