What's the difference? MC7355 and EM7355

I’m deploying a few Panasonic Toughbook CF-31s and I’m trying to determine what the difference is between the MC7355 and the EM7355. Both modules look essentially identical other than the model number, but on Panasonic’s website they only offer drivers for the EM7355. What is the actual difference between these two seemingly identical modules?

The connector size and pinout are different

Interesting, I hadn’t noticed that. Is that the only difference? I thought they were both just M.2 – the connector appears to be the same and I can’t see any difference.

Does this mean that only the EM will work with the Toughbooks? Not the MC?

You need to open the case and check the connector

For the size of the connector, you need to check product technical specification