To my knowledge, it won't hurt anything. You can't go from '94/'95 to '93 because the alternator won't do it's thing without a signal from the cluster, but the reverse is not true. IIRC, the airbag circuit has some funkery in it that will make the airbag module beep if there isn't a completed circuit through the light.
I also believe the PSOM calibration is different between Lightning and non-Lightning due to the different speedo needle sweep, but that's some rusty old memory there.