@Rowan & all,
Silver Efex Pro 3 deletes the controlpoints, when applying a new recipe,
but at least gives you a warning. – SEP 2 did (and does) NOT delete the controlpoints.
The very same happens to Viveza 3 and 2 (v2 didn’t have recipes yet).
So yes, there should be an option to delete / keep the controlpoints when changing the recipe,
at least in SEP 3!