Left panel: Comparisons between N-body simulations, e-Mantis and FORGE for |f_R0| = 10⁻⁵. N-body data from simulations run by MG-AREPO and ECOSMOG codes are taken from the latest comparison project presented in Paper 1. We also include the prediction of FORGE where the cosmological parameters in the fiducial ΛCDM simulation, Ω_m = 0.31315 and h = 0.6737, are used to make the prediction (FORGE Node 0). Right panel: Comparison of four prescriptions with an N-body simulation run by MG-AREPO. This simulation is one of the simulations used for training to construct the FORGE emulator (Node 13). The measurement of the power spectrum was done in Paper 2.