For 2015, the year of my truck: SRW gasser has a 11,400 GVWR. SRW Diesel has a 12,300 GVWR. They add 900# to the GVWR to compensate for the extra weight of the diesel so the payload capacity of each truck is almost identical. However, the VIN on the build site should match the door sticker.
One thought is that the build will list two GVWR. The 11,300# for the basic truck configuration and then the 12,300# for the optional diesel.