IATF 16949: 2016 standard states as follows in its article 10.2.6.
‘’The organization shall perform analysis on customer complaints and field failures, including any returned parts, and shall initiate problem-solving and corrective action to prevent a recurrence. Where requested by the customer, this shall include analysis of the interaction of embedded software of the organization's product within the system of the final customers' product The organization shall communicate the results of testing/analysis to the customer and also within the organization.’’
Therefore, it is always necessary to send the correct analysis report.
If it is seen in the IATF 16949:2016 audits that you have submitted the wrong report, this issue must be handled as non-conformity. As you realize, you can apologize to your customer and send the correct report.