I, too, was looking into this and had assumed that the 08M2 SM had replaced the older 08M in the module as a matter of due course (since the older 08s are now considered "obsolete". Decided to look, and, to my surprise, this transition has apparently not been made. While it is not absolutely essential for me to have the 08M2 for the application I have in mind, I really would like to give it a go due to the new features that might prove eminently useful (and the higher speed, etc. of course).
Cheers,