Range of KN light curves for binary configurations consistent with the chirp mass of GW190425. The ranges are computed including the uncertainties in the fitting formulae for the ejecta and disc masses. For BHNS cases, upper bounds are obtained considering χ_BH = 0.99, while lower bounds are obtained considering χ_BH = 0. Left, central, and right panels: respectively, the g (484 nm), r (626 nm), and J (1250 nm) bands. The orange and blue regions refer to BHNS mergers for the EoSs APR4 and DD2, respectively. Dark orange dotted and light blue hatched regions refer to NSNS mergers for the EoSs APR4 and DD2, respectively. Grey horizontal lines correspond to the limiting magnitude in the GW190425 EM follow-up with ZTF, assuming a distance d_L = 161 Mpc.