Replacing a source package with two?

[kari@sammakko.yok.utu.fi (Kari Pahula)]

The package crossfire-maps-1.4.0-1 is currently based on a single
source package.  Upstream has split the maps in later versions to two
map sets, -big and -small.

I was thinking of handling this situation by making crossfire-maps-big
and crossfire-maps-small and by putting to both of them:

Conflicts: crossfire-maps
Provides: crossfire-maps
Replaces: crossfire-maps

Also, I would copy crossfire-maps' changelog to both -big and -small.

crossfire-server and crossfire-maps have in them:

Depends: crossfire-maps, ...

Would this be a correct way to do this?