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WEBENCH® Tools: mark difference

Tool/software: WEBENCH® Design Tools

Hi sir

For part number : LM2576T-ADJ/NOPB

my question is : what the difference of the "A4"and "V3" on the picture which  in the red circle . what does it mean? and how is the difference , and why , looking forward to your kindly reply ,thanks
 
best regards
thanks 
David