Aaron Axelsen

Overrides the <code>wp_notify_moderator</code> function located in pluggable.php. By default, wordpress does not notify a comment author of a moderation 
event. This plugin will look at all users in the blog, and notify anyone who can moderate the plugin, along with the admins and the author 
of that post. This has been tested and does work with WPMU as well.

Post Author Comment Notification

Overrides the wp_notify_moderator function located in pluggable.php.  By default, wordpress does not notify a comment author of a moderation

kingjeffrey

From the authors of <a href="https://wordpress.org/extend/plugins/wp-typography/" rel="ugc">wp-Typography</a> comes wp-AuthorComment, allowing you to uniquely style post author’s comments.
View the <a href="http://kingdesk.com/projects/wp-authorcomment/" title="wp-AuthorComment Homepage" rel="nofollow ugc">wp-AuthorComment homepage</a> for more information.

wp-AuthorComment

Uniquely style the post author's comments.

Post Author Comment Notification vs wp-AuthorComment