Yes, Mazda has the Ford affiliate plan, they call it the S plan. Your PIN for the X plan will work. That is how I bought my 6.
You can get there from here... https://www.fordpartner.com/Login/login.asp
Just login as you would for the X plan and there is a Mazda link. Volvo, land rover, Jag and many others too.
I got my 6s for $700 below invoice.