Jet coupling in closely spaced nozzles has been extensively studied in idealized conditions, particularly for supersonic rectangular twin jets operating under identical parameters. However, this symmetry does not reflect the reality of aircraft operation, where discrepancies in engine health, wear, or manufacturing variations often lead to non-identical nozzle conditions. As a result, the coupling mechanisms between non-identical jets remain poorly understood. This research aims to investigate the aeroacoustic interactions between two closely spaced rectangular nozzles operating at slightly different conditions. By examining how variations in operating parameters influence jet coupling, this study seeks to improve the understanding of real-world jet interactions and their implications for noise generation and structural fatigue in aerospace applications.