Yes, they also take Bluegreen points, so many of their reservations are less than a week. They should be able to accommodate your change easily.
Try asking the resort if they can accommodate you. It is off-peak so they may have extra space to allow you to switch. Ours was from Sat-Sat but RCI told me we could exchange for Fri-Fri or Sun-Sun if units were available. Good luck! This is a wonderful resort :)
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