Monte Carlo tests with mock clusters show that fitting Gaia-like photometry with isochrones from different stellar codes produces biases of 0.6 to 1.5 in ΔY/ΔZ unless identical models are used for generation and fitting.
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A critical analysis of main-sequence fitting in open clusters to derive the helium-to-metal enrichment ratio $\Delta Y/\Delta Z$
Monte Carlo tests with mock clusters show that fitting Gaia-like photometry with isochrones from different stellar codes produces biases of 0.6 to 1.5 in ΔY/ΔZ unless identical models are used for generation and fitting.