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With the advancements in autonomous driving technology, the potential for passengers to adopt a variety of postures in vehicles has emerged. Current crash analysis methodologies primarily evaluate and optimize passenger postures based on typical sitting positions. However, there is a pressing need for the evaluation of diverse postures. In response to this evolving trend, various regions are preparing to assess passenger injuries associated with relaxed postures, with domestic market and China targeting evaluation post 2027. This paper examines the injury assessment of passengers in a resting position in the Korean New Car Assessment Program (KNCAP) to be launched later. Focusing on a 39-degree reclining posture for front seat passengers, this study evaluated the consistency of the actual crash test and the crash analysis, and to reveal a significant correlation between major injuries. Based on the results of this study, the consistency between the test and analysis of passenger safety in the relaxation posture is confirmed, and the criteria for introducing a virtual test methodology in the future are proposed.