  We perform a systematic comparison between photoelectron momentum
distributions computed with the rescattered-quantum orbit strong-field
approximation (RQSFA) and the Coulomb-quantum orbit strong-field approximation
(CQSFA). We exclude direct, hybrid, and multiple scattered CQSFA trajectories,
and focus on the contributions of trajectories that undergo a single act of
rescattering. For this orbit subset, one may establish a one-to-one
correspondence between the RQSFA and CQSFA contributions for backscattered and
forward-scattered trajectory pairs. We assess the influence of the Coulomb
potential on the ionization and rescattering times of specific trajectory
pairs, kinematic constraints determined by rescattering, and quantum
interference between specific pairs of trajectories. We analyze how the Coulomb
potential alters their ionization and return times, and their interference in
photoelectron momentum distributions. We show that Coulomb effects are not
significant for high or medium photoelectron energies and shorter orbits,
while, for lower momentum ranges or longer electron excursion times in the
continuum, the residual Coulomb potential is more important. We also assess the
agreement of both theories for different field parameters, and show that it
improves with the increase of the wavelength.
