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They are the same, limited time keys just different naming.

Normally, alpha lacks planned-for-1.0 features (so, for example, no guns models, not all classes, not all skills) , beta lacks polish (bugs, poor optimization).
But this days, devs/publishers often use alpha/beta as marketing name, or mix it together.

For example, Killing Floor 2 can be considered an Alpha since it lacks two classes, but devs call it "polished beta".

From the giveaway page...
"THESE KEYS ARE GOOD FOR ACCESS TO THE ALPHA WEEKEND

AUGUST 6TH, 9AM PDT - AUGUST 7TH, 6PM PDT"