Should I use Release Confirmation details on both 1099s imported for sale of RSUs or only the form for the Sell-to-cover taxes, the 2nd 1099 is for $ actually received?

I am very confused concerning my 1099b forms from a single sell of vested RSUs.  I have two separate 1099b's, one seems to be the sale to cover the taxes and the second form is the sale of the amount I actually received.  I only have 1 Release Confirmation and 1 Year End Stock Plan Summary to reference for Cost Basis details.  (Morgan Stanley - single release date, single award date, single vest date, single sold date, all same on both 1099s)