The fixtures to the floor of the car are the same but the fixtures to the seats are different. Recaro seats with ek9 rails will fit all ek/ej shape civics, as will your em1 seats and rails. But the recaro seats will not fit em1 rails.
So I need to remove the Mitsubishi rails then fit ek9 or Dc2 ones?
The passenger recaro?
I can't see why not. The reclining wheels and levers are on both sides of the seat so they should go in either way. Its only the rails that are side specific.