  We briefly describe two statistical hadronization models, based respectively
on the presence and absence of light quark chemical equilibrium, used to
analyze particle yields in heavy ion collisions. We then try to distinguish
between these models using $K/\pi$ fluctuations data. We find that while the
non-equilibrium model provides an acceptable description of fluctuations at top
SPS and RHIC energies, both models considerably under-estimate fluctuations at
low SPS energies.
