different data for the transformer (PI Expert and PIXls)

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I work with LNK420 with PI Expert and PIXls. At the same input parameters in VAC(170-265), I = 0.9A, U = 48V and the same core ETD29 get different data for the transformer (windings, Gap (0.658 and 0.955), the inductance 793 and 691). Who precisely PI Expert or PIXls?