It is dimmer! Though somehow the camera exaggerated it. I think the reason for this is that the current for the right-digit is switched by an N-type MOSFET with a drain to source voltage of .1 volts, while the left-digit is switched by a P-type with a d-s voltage of over 2 volts, so the segments of the right digit are receiving considerably more current. The P device could be replaced with an N device so that the digits would both have the same brightness. This would require an additional transistor and resistor to invert the signal driving the replacement N.