Because they have different behaviour.
For example, if you assign the type 4 to a battleship, it will work as a destroyer (trying to ram you, doing DC runs....).
Also, type 408 can't be spotted by the crew.
But considering ALL the English.cfg, it shows again that some ideas were finally not taken into account in the final released game (Type202=Missile Submarine, Type305=Helicopter, Type405=Missile....)
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