  We relate the asymmetries in the charged pions energy in the decay into
$\pi^+\pi^-\pi^0$ of $K_L$ and of the tagged neutral kaons. The former
asymmetry is a given combination of $\Re(\epsilon)$, $\Im(\epsilon)$, and
$|\epsilon'|$. Moreover, the non-violating CP asymmetry allows a test for the
$\chi$PT predictions within the Zel'dovich approach for the final state
interaction.
