The short answer – there is no difference!

I qualified as a State Registered Chiropodist, but my B.Sc is in Podiatric Medicine – confusing!  Podiatrist was originally the American term, and chiropodist the UK term.  Rather confusingly we now use both, although it is becoming the norm that Chiropody refers to nail and skin work, and Podiatry to biomechanical assessment and orthotic provision.  Look for someone who is registered with the Health and Care Professions Council, and to be sure they have completed a 3 year university course, look for someone who has a B.Sc qualification.