  The pairing properties of nuclear systems are a sensitive probe of the
effective nucleon-nucleon interactions. We compare the 1S0 pairing gaps in
nuclear and neutron matter derived from the phenomenological Gogny interaction
and a renormalization group motivated low-momentum V_low-k interaction
extracted from realistic interactions. We find that the pairing gaps predicted
by these interactions are in an excellent agreement in a wide range of
sub-nuclear densities. The close agreement between the predictions of the
effective forces remains intact in the case where the single particle spectra
in neutron and nuclear matter are renormalized within the Hartree-Fock theory.
