Main panels: SFR vs. M_★ for galaxies that experienced a major merger in the last ∼200 Myr at the time of observations at z = 2, 3, and 4. First and second columns present the distribution for CM (blue shades) and C-Gal (orange lines) for TNG300 and TNG100, respectively. The third and fourth columns display the distribution for FM (green shades) and F-Gal (light violet lines) for TNG300 and TNG100, respectively. Top and right side panels: Marginalized histograms for the stellar mass and SFR of the different galaxy samples at z = 2,3, and 4 for TNG300 and TNG100. The overall distributions of SFR and M_★ for the CM and FM galaxies are markedly different from those of C-Gal and F-Gal. In particular, CM galaxies show a significant excess on the high-mass end in their mass distribution with respect to the C-Gal population. Furthermore, among the CM, FM, C-Gal and F-Gal groups, we find that the median SFR and M_★ values are the highest for CM galaxies.