For some reason, I have the numbers 25 mw and 100 mw in my head. I think that's the maximum allowed for EC vs FCC? So with that, thinking in general terms, I'd imagine the expected range for FCC is about twice EC.
So yeah, I think, in general, it would be reasonably expected that if you modded the EC controller, that is, one simple mod whether it be a good antenna or an amp, its range would be something close to an unmodded FCC controller.