Non AC Heater Boxes, Are All the Years the Same

Our 73 sport was completely missing the heater box. I went to U-pull-it today and got one from a 71 valiant complete with blower, heater core, and cables for $23. Drilled four holes in the firewall and it bolted right up. Have not hooked up the cables yet but looks fairly easy. The firewall plate that came with it covers the original three mounting holes. I won't win a concours but we have heat and defrost for cheap.