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Obvious visual deference aside (Can be ignored as its a prototype) are they both same ships or the one in the Rebel is a different class of ship entirely? Because from the detailed othro, the ship looks bigger than the Legends Interdictor.
It's Interidictor class.
It's purpose remains the same, merely a slightly different interpretation of design.
(Which, agreed can just be ignored and passed off as a prototype)
I wouldn't expect different classes till later on after the battle of Yavin.
im gonna say the 418 is a advancment of the rebels interidictor
I agree with taliskyim as the 418 is the advanced for while the rebels one is the early prototype or prototypes cause there could be more than one.