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Both of the expansion boards are the same. If you buy the first or second option it will work with your Edison module (if the module and expansion board are fine).
As you have seen, in Mouser you can find an Edison Module and an Edison Module2, the same for the expansion boards, in this case the Arduino Expansion Board. Mouser uses this for the certifications required in different countries, but it is the same product. As you see, both have the same price and features.
I suggest you to contact Mouser in order to know which option you should buy according to the country where you are.