类结构图：

image.png

通过类结构图清楚的了解到BeanDefinitionRegistryPostProcessor继承了BeanFactoryPostProcessor接口，关于BeanFactoryPostProcessor接口不了的朋友可以查看Spring Boot 源码分析 —— 后置处理器

源码注释：

/**
 * Extension to the standard {@link BeanFactoryPostProcessor} SPI, allowing for
 * the registration of further bean definitions <i>before</i> regular
 * BeanFactoryPostProcessor detection kicks in. In particular,
 * BeanDefinitionRegistryPostProcessor may register further bean definitions
 * which in turn define BeanFactoryPostProcessor instances.
 *
 * @author Juergen Hoeller
 * @since 3.0.1
 * @see org.springframework.context.annotation.ConfigurationClassPostProcessor
 */
public interface BeanDefinitionRegistryPostProcessor extends BeanFactoryPostProcessor {

    /**
     * Modify the application context's internal bean definition registry after its
     * standard initialization. All regular bean definitions will have been loaded,
     * but no beans will have been instantiated yet. This allows for adding further
     * bean definitions before the next post-processing phase kicks in.
     * @param registry the bean definition registry used by the application context
     * @throws org.springframework.beans.BeansException in case of errors
     */
    void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException;

}

接口注释：

对标准{@link BeanFactoryPostProcessor}SPI的扩展，允许在常规BeanFactoryPostProcessor检测启动之前进一步的注册bean定义。特别是，BeanDefinitionRegistryPostProcessor可以注册其他bean定义

方法注释：

在标准初始化后修改应用程序上下文的内部bean定义注册表。所有常规bean定义都将被加载，但bean没有被实例化。这允许在下一个后处理阶段开始添加更多的bean定义。

总结：

BeanDefinitionRegistryPostProcessor与BeanFactoryPostProcessor可以在容器所有bean实例化之前对所有BeanDefinition进行定义、修改、删除。

个人建议：
BeanDefinitionRegistryPostProcessor做bean的定义
BeanFactoryPostProcessor用作BeanDefinition修改

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