Can you fit the 1200GSA top box to an 1150GSA?

[essjay]

I asked the question in the thread below where Nick fitted a set of 1200GSA panniers to an 1150GSA but got no replies.

So does anyone know can you get a plate or something similar to mount the 1200GSA topbox to the 1150GSA?

Also is it possible to match the locks on the 1200GSA luggage to a key from an 1150GSA?

Thanks....