What SD card to buy for the GoPro Hero 4 Silver Edition

I've been looking for a sd card to use with the recent GoPro I bought but am unsure what the difference between sandisk extreme plus - SDSDQX-064G-A46A and SDSDQX-064G-AA4A are.

There is just a number difference of the 1 and 3 but what does this mean?
If possible can someone link me to buy a cheap sd card.

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