  We match the non-relativistic quark model, with both flavor dependent and
flavor independent effective quark-quark interactions, to the spin-flavor
operator basis of the 1/Nc expansion for the L=1 non-strange baryons. We obtain
analytic expressions for the coefficients of the 1/Nc operators in terms of
radial integrals that depend on the shape and relative strength of the
spin-spin, spin-orbit and tensor interactions of the model, which are left
unspecified. We obtain several new, parameter-free relations between the seven
masses and the two mixing angles that can discriminate between different
spin-flavor structures of the effective quark-quark interaction. We discuss in
detail how a general parametrization of the mass matrix depends on the mixing
angles and is constrained by the assumptions on the effective quark-quark
interaction. We find that, within the present experimental uncertainties,
consistency with the best values of the mixing angles as determined by a recent
global fit to masses and decays does not exclude any of the two most extreme
possibilities of flavor dependent (independent) quark-quark interactions, as
generated by meson (gluon) exchange interactions.
