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This is the same question i posted 1 week ago: gaming.stackexchange.com/questions/3730/… And so far, everybody told me that no, the digital version don't have guest passes.
Just a little update. I have been talking to Blizzard's support, and they told me that LA clients PLAY with NA clients. They are in the same b.net cluster/gateway, called just "The Americas". The difference is if you bought LA key, you can just use LA client (Portuguese and Spanish languages) and if you bought NA key, you can use just NA client (en-us).