If you use numbers as reference for different starships design? Which would not really make any since, and that a real space organizing would never have name a spaceship/starship class after a number. They will not name a starship, USS Starship. If a rich person and a few space organization decided together and decided to build the Enterprise 1701? They will build two ships. the USS Constitution and USS Enterprise. Both ships probably would been built at the same time? The Constitution would be LRRMS-1 and the Enterprise would be LRRMS-2. Or Nuclear Cosmologies Craft, Constitution NCC-1 and Enterprise NCC-2.