So, there are quite a few differences between the two, actually. Rice plantations on the coast of South Carolina were HUGE. Bigger than almost any cotton plantation around. Therefore, there was a larger concentration of slaves in the area. This made many white people nervous since the ratio of white-to-black inhabitants was consequently different.

One of the biggest differences was the degree to which the slaves were left along on rice plantations. Masters rarely visited the slaves on rice plantations due to the diseases that existed in those swampy regions. The main time they stopped by was to collect that year's harvest. This means that rice slaves were able to form their own culture largely without interference. They formed their own language and religion because of that. The Gulla islands of the coast were left largely alone until the twentieth century and many still speak the Gullah language and dialect.

The culture of these slaves remained very African or Creole (there's some debate on which one to this day). Traditions of the significance of water and may African rituals remained powerful and shamans and other religious figures kept hold of a great deal of unofficial power. Occasionally these religious figures even held some power of the local white population.

For further reading check out: Judith Carney, Black Rice, Stephanie Camp, Closer to Freedom.