Comparing the calculated mass steps from simulations using both the achromatic and dust-based intrinsic scatter models to the mass steps derived from both data in this work (left panel) and data from CSP-I & II from Uddin et al. (2023) (right panel) as a function of wavelength. The mass step values from this work are calculated with a mass step location at 10¹⁰ M_⊙ while values from Uddin et al. (2023) are calculated using the data sample’s median mass as the mass step location (10.2–10.4 dex). The simulation values are the same in both panels, and 1σ uncertainties are shaded for all mass step values.