I'm an automotive glass tech, there is little to no difference in OEM vs OEE Glass. Though I would ask safelite for the brand of the glass. There is OEE and Alternate branded glass. OEM in GM Trucks depending where the truck is assembled is Vitro & Fuyao, and both of these manufacturers are very good. If they were to tell you that they're putting in a XYG, or PGW China piece of glass I would recommend elsewhere.
TLDR, ask safelite to do a brand check and see if its Fuyao, or Vitro.