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ADSP-BF548BBCZ-5AA AA = low Alpha Package

Hello.

What is the difference between ADSP-BF548BBCZ-5A and ADSP-BF548BBCZ-5AA versions ? "AA = low Alpha Package"

Both packages are the same 400-Ball CSPBGA (17mm x 17mm x 1.7mm), I have checked material declarations and didn't find difference.

Somewhere i read about Low Alpha activity PB-free solder for internal connections, is AA package means that internal connections made with low alpha activity solder to prevent soft erroers?

Thank you in advance.