Charcteristic x-rays G4 vs MCNP

I have simulated x-rays spectra using GEANT4 and MCNP codes, but i get a large difference in the fluorescence peaks.
Is there some explication for this difference?
Capture d’écran de 2021-10-11 15-00-26

many regards

It may depend on the X-ray yield of the data libraries adopted in the 2 Monte Carlo simulation codes. I suggest to compare directly the data library yields.

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Thanks for the answer,
Yes exactly, but I can’t find mcnp data.
I don’t know if someone can help