I hope not. I have ordered 15pcs before and used the M3 as the core of our product.
Technically I can use T3 but it has a bigger footprint.
Using the M2A, means we cannot use the sd card images made for M3 for M2A.
With this, I would like to ask FriendlyElec admins one very important question. What is the lifespan of your product in terms of support and production?