AFAIK all WP messages can be altered by filter or pluggable function. Each type of message will have its own filter and function. ‘wp_new_user_notification_email’ is the filter for new user notifications only. It can be difficult to learn the right filter for any given message. I’ve resorted to grep
ping (Linux full text search) the source code for some key phrase in the message. That usually turns up the right function, where the corresponding filter would be applied.
I believe WooCommerce messages do something similar. If you have trouble finding filters for WooCommerce, I recommend asking in their dedicated support forum for assistance.