I believe the A4000 keyboard uses a PS/2 connector and the Amiga 3000 is the same as the Amiga 2000.
The OP is right, the Amiga 3000 keyboard is different than the Amiga 2000's keyboard. I think it looks nicer. But I think the entire Amiga 3000 looks nicer. :-)
-P
The 3000&4000 keyboards looks the same though. There is an adapter for the connection in the back.
Rich
ny