Yes. I have done such swaps on my two Pintos (78 Sedan came first, restoring a 73 Station Wagon using 78 parts I have collected over the years).
The only things you mentioned that won't work are the instrument switches, assuming you are talking about the wiper and headlight switches. The 78 headlight switch has a dimmer, 73 does not. If you are thinking of the instrument cluster as well, that is also different due to a different wire harness connector, same goes for the switches.