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@CamPhil
You don't need to change mech to go between 8 &9 gears, the gears are closer together (so the range will be similar) and the indexing is done at the changer, not the mech.
The pull ratio between the amount of cable and the amount of sideways movement of the cage is all that matters, and that's the same on all late Campag mechs.
Just fit the right cassette and changer, and set up limit screws and indexing.