  The phase equivalence of the theoretical quark mixing matrix ${\bf V}^{th}$
derived from the breaking of the flavour permutational symmetry and the
phenomenological parametrizations ${\bf V}^{PDG}$ and ${\bf V}^{KM}$ is
explicitly exhibited. From here, we derive exact explicit expressions for the
three mixing angles and the CP violating phase of the two phenomenological
parametrizations in terms of the quark mass ratios $(m_{u}/m_{t}, m_{c}/m_{t},
m_{d}/m_{b}, m_{s}/m_{b})$ and the parameters $Z^{*1/2}$ and $\Phi^*$
characterizing the preferred symmetry breaking pattern. The computed values for
the CP violating phase and the mixing angles of the standard parametrization
advocated by the Particle Data Group are $\delta^*_{13}=73.2^\circ$,
$\sin\theta^*_{12}=0.222$,
  $\sin\theta^*_{13}=0.0036$, and $\sin\theta^*_{23}=0.040$. The computed
values of the CP-violating phase and the mixing angles of the Kobayashi-Maskawa
parametrization are $\delta^*_{KM}=96.4^\circ$, $\sin\theta^*_{1}=0.2225$,
$\sin\theta^*_{2}=0.0384$, and $\sin\theta^*_{3}=0.0162$. In both cases, the
numerical values of the mixing angles and CP-violating phase computed from
quark masses and the flavour symmetry breaking parameters coincide almost
exactly with the central values of the same parameters obtained from a fit to
experimental data.
