These are two different roles, and it’s important to distinguish them.
Chiefs of staff are operators. They work a leader’s will, ensuring that what an executive has decided is actually executed.
Consiglieres are counsellors. They also need high executive function, but their role is about deciding which trains ought to run and where, rather than keeping them running on time. (That’s the chief of staff’s job.)
Both great roles, but worth knowing which is which — and which you want.