  Particle-in-Cell (PIC) codes are a popular tool to model laser-plasma
interactions. Many different PIC codes already exist, and many new PIC codes
are being developed constantly. It is therefore important to compare different
PIC codes to ascertain which code is best suited for a particular kind of
physical problem. In a paper by Smith et al. (2021) they compared three
different codes on a problem relating to proton acceleration in the Target
Normal Sheath Acceleration regime from a normal incidence ultra-intense laser
pulse. Smith et al. (2021) included in their study the widely used EPOCH code.
However, they did not include results from the Smilei code, which is another
popular PIC code in the plasma community with a variety of features and physics
packages. In the present work, we compare the Smilei code to the EPOCH code for
the same test case as Smith et al. (2021). Broadly we find the two codes to be
highly consistent with agreement in total ion, electron, and field energy at a
percent level or better. The electron and ion energy distribution functions
agree well at lower energies and the differences at higher energies (e.g.
because of the finite number of macroparticles) are similar to what Smith et
al. (2021) saw for other codes. We found that Smilei consumed 25% more RAM than
EPOCH did but the execution time was 30% less for Smilei on one processor. We
include the input files to encourage future comparisons.
