The amount on your W-2 is the value of the RSU's at vesting (when you gained ownership). You receive a 1099-B when you sell the shares, so the proceeds on your 1099-B could be higher or lower than the amount on your W-2, depending on how many of the shares you sold and the selling price.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
