The usual sensor V5 shield has a blue pcb layer, that is a slightly darker blue than the standard Arduino blue, while the DFRobot shield is called an IO shield, and has a black pcb layer. I have the V4 shield, and it was made by flamingoeda. You might expect the V5 one is as well is built by them as well, but I've also seen Emartee and SainSmart list sensor shield V5's.