The calculations of isotopic amplitudes and their results for the direct
CP--violating charge asymmetry in K±→3π decays within the
nonlinear and linear (σ--model) chiral Lagrangian approach are compared
with each other. It is shown, that the latter, taking into account intermediate
scalar resonances, does not reproduce the p4--corrections of the nonlinear
approach introduced by Gasser and Leutwyler, being saturated mainly by vector
resonance exchange. The resulting differences concerning the CP violation
effect are traced in some detail.Comment: 14 page