Thanks for replying!
When I open the save location profile0/saves/worldmap/worldmaps/SurvivalIsland
There are 13 Zip files
Custom-193 to 200
Survival-1 to 2
Traditional-1 to 3
Tried renaming all 13 Zips to Sandbox-1 to 13.
Started RTR from steam, but before the game launched, I saw the old save files popping back into the folder, making it 26 zips.
While in game, nothing had changed. same settings.