Cross-comparison of redshifts from different sources: z₁ – Gaia Collaboration (2023a); z₂ – Storey-Fisher et al. (2024); z₃ – Dey et al. (2023); z₄ – all other sources (listed in Table B.1), including this work redshift preference when available. Left: z₂, z₃, and z₄ vs. z₁. Right: z₃ and z₄ vs. z₂. The published measurement errors are shown, except for Dey et al. (2023) who do not list them; in this case for plotting purposes we adopted errors equal to 0.005 dex. The bracketed numbers in the legends show how many objects constitute the overlapping subset between each pair of samples. The black dotted line has a slope of one.