About Coulomb Potential

With LAMMPS, the Coulomb potential is
kQiQj/r (k: constant)
but in some papers (Guillot and Sator, 2007, Matsui, 1994),
QiQj/r
and no constant is given.
In this case, is the value of the charge to be input to LAMMPS different from the values given in the papers without these constants?

In this case, is the value of the charge to be input to LAMMPS different from the values given in the papers without these constants?

It depends on the units, for some unit systems the constant is 1.0.

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How can it be confirmed?

Please note, this is no longer a discussion about LAMMPS but about basic understanding of physics and thus off-topic for the LAMMPS categories of MatSci.org.

I suggest you discuss this with your tutor or adviser.