Both are part of the response payload of fetchKYC API Response.

“original_kyc_info": Is the original information extracted from the ID Document image as a result of OCR ( Optical Character Recognition )

declared_kyc_info": This is the result of the “Verify Detail Page” in the SDK. Depending on the configuration of the client-specific flow, if “Verify Detail Page”.  "Verify details page" allows the user to see the OCR results and edit the details obtained via OCR. This is edited information is called the “user-declared information”.