I want to change to be known as Ms. When looking on google about how to do that I came across a mn thread where there was some debate over pronunciation. Now I'm genuinely unsure...but obviously have to make a "Statement" for you to agree/disagree with to get a vote! 
I've heard Ms being mis mizz and miss being well...miss. but thread seemed to suggest that was nonsense and both should be miss.
So yanbu is they are pronounced differently
Yabu is they are the same.