shld be error i think. where is all the BS sifu, need their opinions normally my practise of finding error is hold another 1 or 2 pcs of the same hw and do a scan. its easier that way. if got error easier to spot it.
left card lighter shade of red than right card. the back also have a different kind of shades in grey/black. maybe its a printing defect in colouring/toning. sorry camera at best quality. adding to the factor that the cameraman also at his best quality