Not sure. I've heard before there's a slight plastic piece you may need to dremel. It IS a bigger keyboard / differently shaped, just looking at my T25 sitting next to my T480. As well, sourcing T25 keyboard in the first place may not be trivial - it was a very limited run model.

Some historical discussion on the topic:

https://forum.thinkpads.com/viewtopic.php?t=125246

Here are details of how someone put together a t480 with the t25 keyboard. It's an expensive project:

https://www.xyte.ch/mods/t25-frankenpad/