Few people would dispute the attribution of the older plaque to Scott of Southwick. The colouring of the later plaque is so similar to the plate, it seems probable that it is Scott too.
Baker, however, states that 'according to the firm's records, Scott's supplied earthenware to Moore's Wear Pottery and to the Bridge End Pottery, presumably plain for decoration. Scott's also purchased ware from both Maling and Fell of Newcastle.' Moore's pottery, a short walk from Scott's, used similar transfers, and it's possible they decorated each other's plaques, or sent them to the same place for decoration.
Until an orange plaque marked Scott turns up (which seems unlikely) it's impossible to attribute this plaque form with complete certainty.