Figure shows the exciton diffusion coefficients as obtained from kinetic Monte Carlo simulations using coupling values from DFT as well as from the GNN. The majority of diffusion coefficients agree well between the DFT and GNN results. However, there are some discrepancies for the various IDIC crystals. We note that there are two values for ITIC-2Cl with different diffusion coefficients. This is due to the two different crystal isomorphs that are known experimentally. While the isomorphs have different diffusion coefficients, our framework correctly predicts their diffusion coefficients when compared to ones obtained using DFT. Thus, our GNN-based framework is effective for predicting exciton diffusion coefficient for the important case of FREA molecules.