Question on conversation subjects in Requests

I noticed the default subject in emails regarding requests contains ## (request number) ##. Does the ticket number have to be encapsulated in double ## symbols in order for these emails to make their way into the request conversation(s)? If I were to modify the following (default) email subject of:

Request id ##$RequestId## is appended with your recent reply.

To...

Ticket # $RequestId is appended with your recent reply.

Would the conversation functions still function? I haven't had my Email Administrators enable IMAP for me to actually evaluate the email components of the product, so I'm unable to just test it out on my own at this point. I'm curious if the double pound symbols are required, and if so, if the requirement can be modified.

Thanks.