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We calculate the contributions of a particular set of charge asymmetric ΛN interactions to the difference of the separation energies of 4 Λ He and 4 Λ H. We use perturbation theory with four-body variational Monte Carlo wave functions calculated from a Hamiltonian with two-and three-hadron forces. We compare with the data and with an earlier calculation made by one of us which employed a two-body wave function of the Λ-nucleus type.