DataKeyFrame2 behavior is the same as DataKeyFrame behavior, with the same parameters. The plugin was created because it is not possible to add the same function plugin twice to the same container.
Note: This plugin is deprecated. DataKeyFrame2 became obsolete when the parameter Use Remote Container was added to the DataPool plugins. The plugin is continued for backwards compatibility only, to support scene already using this plugin. When creating new scenes, use the DataKeyFrame plugin with the Use Remote Container option set to On.