TPS737: Why two kind of “PACKAGE OUTLINE”s

Tool/software:

Hello,

My customer plans to use TPS73701DRBR.
According to the datasheet TPS73701DRBR package drawing is DRB.
However, there are two kinds of “PACKAGE OUTLINE”s called “DRB0008B”(on page 36) and “DRB0008A”(on page 39). Which is the true package outline for the TPS73701DRBR, “DRB0008B” or “DRB0008A”?

Best regards,

K.Hirano