Yes, they are totally different. HIPPA sets standards for protecting sensitive patient data. All healthcare entities must follow HIPPA standards and be complaint. FHIR on the other hand is a standard for interoperable data exchange. There should be a mechanism for exporting or securely sharing the PHI information and that’s where FHIR, HL7 V2, V3 etc. standards come into picture. You might be aware of EMR, EHR, PHR systems etc. they are HIPPA complaint and do support standards for interoperable data exchange.