South Carolina's GOP is not nearly as far right as NC's GOP, having lived in both states and interacted with both. Although, Republicans in the Lowcountry tend to be more liberal than those in the upstate. My experience could be biased.
I would agree from what I’ve seen. The low country is much more country club, old money kinda types who tend to vote for the more economic center charismatic guy. Rubio won Charleston County in 2016. Though Warren did win it in 2018 and I thought it him as the more conservative choice