This does NOT matter
Every single one of the planned SLS launches is to the Moon, with the upcoming ones building the LOP-G space station. Not Mars or anything. There was a planned launch to send Europa Clipper to orbit Jupiter, but the Trump administration's NASA budget proposal has indicated that mission will likely be flown on a commercial launcher instead.
By the time SLS is ready to go anywhere beyond the Moon, SpaceX's BFR will be able to send more mass faster, and even more so with in-orbit refueling.