That second one looks more Lambdalike, although more like someone sat on a Lambda.
Storyline wise, the Missile Boat, along with the XG-1 Assault Gunboat are manufactored by Cygnus Space Works. The same company that manufactures the Lambda Shuttle. It would make sense that asthetically they would look related.
Yeah, it would. Though I never shook the feeling that the XWA one was a completely different ship, same in many ways, but maybe with two pilots judging by cockpit width, and cheaper production costs with design refinements.
