This tool can update configured features to a newer Minecraft version.
java -jar minecraft-worldgen-updater-2.0.0.jar update features <configured input> <placed input> <configured output> <placed output>
These should be references to the folders that contain the feature files.
java -jar minecraft-worldgen-updater-2.0.0.jar update features <input folder> <output folder> --legacy
Input should be configured features, and the output will be placed features.