Comparison between the derived [Mg/Fe] abundances of the X-shooter catalogue (Santos-Peral et al. 2023) and those measured when we used the synthetic grid by Knowles et al. (2021) and the BOSZ library as the reference in the applied methodology. Top row: stellar abundance ratios [Mg/Fe] vs. [Fe/H] from Santos-Peral et al. (2023) (top-left), with the grid by Knowles et al. (2021) (top-middle), and with BOSZ (top-right). The red line reproduces an empirical [α/Fe] approach for comparison purposes. Bottom row: direct comparison of stars in common between the derived [Mg/Fe] abundances in Santos-Peral et al. (2023) and those with Knowles et al. (2021) (bottom-left), between those with Knowles et al. (2021) and with BOSZ (bottom-middle), and Anally between Santos-Peral et al. (2023) and those with the BOSZ grid (bottom-right). The black dashed line reproduces the 1:1 relation. The mean (μ), standard deviation (σ), median, and robust standard deviation (i.e. ~1.48 times the median absolute deviation, MAD) of the offsets are also indicated.