Not sure if you can call it "original". There were many versions of the Raceframe. The frame itself did not change much. The board switched from a dome switch (like the Halo board button) to a leaf switch (microswitch). The trigger went from having a pin behind the trigger (as seen on top frame), to having an internally mounted pin. The last model frame ('05 I believe) had a different style trigger. Also, they put in a setscrew to externally adjust the freekick.
The frontblock and solenoid mount went through a few changes as well. Original Raceframes had solenoid mounts more like this (the top one):
They switched over to smaller noids, and used at least 3 different models of SMC noids, as well as the Asco noid (they called the "F1" noid) that came out in the very last frames produced.
The top frame may not even be a Freeflow frame, just the FF frontblock and a standard frame. Usually, the Freeflow frames had the word "Professional" milled along the top of the frame. The only other way to tell would be to check and see if it uses a 9V (FF's did), or if it uses the Racegun 4.8V NiMH battery.
Obviously, the frontblock on the bottom frame has one of the more recent solenoids, not the big original ones. The only other thing to check would be if it had a dome switch or leaf switch on the board, but you can't tell from that pic.
