The General Health Questionnaire (GHQ-12) and the Pandemic Anxiety Scale (PAS) are two well-regarded instruments used to measure psychological distress and anxiety levels respectively. However, comparing and correlating these two can be challenging, cumbersome, and subjective without a proper tool. This is where Harmony, an innovative AI-powered tool, becomes instrumental. Featuring cutting edge natural language processing and generative AI models, Harmony simplifies comparison of these questionnaires. Using GHQ 12 vs PAS as a case study, we reveal how Harmony brings succinctness, precision, and objectivity to the task. Facilitated by large language models, Harmony compares GHQ 12 and PAS by scanning through all items and quantifying the match percentage between them. This capability of Harmony amplifies the efficiency and accuracy of analysis, minimizing potential human-error and bias inherent in manual comparison. Furthermore, GHQ 12 vs PAS is not enshrined in cultural or language barriers as Harmony amply supports comparative analysis in multiple languages. Simply drag and drop the questionnaires in the web interface of Harmony, and let it do the intricate harmonisation work. The rich database of Harmony also sets it apart, catering to the need of comparative analysis beyond GHQ 12 vs PAS. Choose from available instruments in the database or use your unique scales for the analysis. The application of Harmony extends far and wide, optimally leveraging available cohort and longitudinal studies by facilitating within and across-study comparisons. To bring forth the most of your research efforts, consider using Harmony for your next GHQ 12 vs PAS, or any other questionnaire harmonisation task. It facilitates an efficient, objective, and comprehensive comparison, providing valuable insights that help drive impactful research in psychology and social science.