  We utilize the public GIZMO code to simulate twelve disc galaxies from the
NIHAO suite simulated with the GASOLINE code, then compare the corresponding
galaxies in the two simulations. We find that while both codes with the same
initial conditions and large-scale environments can successfully produce
similar disc galaxies, significant differences are still seen in many
properties of the galaxies, particularly in the circumgalactic medium (CGM)
environment they reside. Specifically, the thermal feedback recipe used in
GASOLINE results in ubiquitous long-lasting collimated outflows, primarily
driven by high-density hot interstellar medium (ISM) from the galaxy center,
and inflows of gas not aligned with the outflow cools rapidly and flows towards
the galactic center. In contrast, galaxies from GIZMO code do not exhibit
large-scale outflows at low redshifts, but instead display quasi-virialized hot
gaseous halos that arise from the strong interaction between inflow of gas and
feedback driven outflow. Therefore, the origins of mass and angular momentum of
the cold disc in the two simulations are quite different, even though the final
morphologies of corresponding galaxies are similar at $z\sim0$. The differences
in the distribution of CGM gas are mainly due to different feedback models
implemented in the two codes, thus future observations of CGM provide valuable
insight into the physics governing the baryon cycle in disc galaxies.
