lol. not completely identical, don't forget, the field frigate and hive frigate! ooooooooo! the two most useless frigates in the game, unless you take the unit cap off
though, the nice thing about salvage corvettes is that they're much easier to pick off than a marine frigate... and they're not armed, either.
Though it is fun to watch someone try and make off with your destroyer, knock two of the corvettes off, and watch the other three spin it around in circles
and who can forget the Kamikaze command? 400 scouts, ramming speed!