In a small or mid-sized business, there is often no real difference between a Finance Director and a CFO. The responsibilities are similar and the title choice is often a matter of branding or founder preference.
In larger or group businesses, however, the distinction becomes more defined. A CFO typically sits above Divisional Finance Directors and takes responsibility for strategic oversight, funding and investor management, while the divisional FD is more focused on reporting, controls and financial delivery within a specific part of the business.