Swapping old Sky+ box for new?

[F3RNY7]

We have cancelled our Sky subscription and as such have one of the newer style black Sky+ HD boxes that is surplus to requirements.

My Mum & Dad have the same box in their living room, but in their bedroom have a much older white Sky+ box which is pretty naff and still runs the old style software on it.

If I give them my surplus new style box, is it a straight swap over? I presume it's just a case of swap out the boxes and put their viewing card in the new box?

[F3RNY7]

Thanks folks