Full Idea
Potentialities are 'potentialities to ....', while possibilities are 'possibilities that ....'.
Gist of Idea
There are potentialities 'to ...', but possibilities are 'that ....'.
Source
Barbara Vetter (Potentiality [2015], 6.4)
Book Reference
Vetter,Barbara: 'Potentiality: from Dispositions to Modality' [OUP 2015], p.207
A Reaction
This feels a bit like a stipulation, rather than a precise description of normal usage. That said, it is quite a nice distinction. It sounds as if an event follows a potentiality, and a state of affairs follows a possibility. Active and passive?