  Perturbative Quantum Chromodynamics (pQCD) predicts that the small-$x$ gluons
in a hadron wavefunction should form a Color Glass Condensate (CGC), which has
universal properties, which are the same for all hadrons or nuclei. Assuming
this property, in this paper we cross relate the current CGC descriptions of
the $ep$ HERA data and $dAu$ RHIC data. In particular, we use the quark dipole
scattering amplitude recently proposed by Kharzeev, Kovchegov and Tuchin (KKT)
to explain the high $p_T$ particle suppression observed in $dAu$ collisions at
RHIC in our calculations of the proton and longitudinal structure functions. We
present a detailed comparison between this parameterization and those proposed
to describe the $ep$ HERA data. We find out that, due to its peculiar
dependence on the energy and dipole separation, the KKT parameterization is
able to describe the experimental $ep$ data only in a limited kinematical range
of photon virtualities.
