What does it matter? If truth be known possibly every dino has some differences, with some minor, some major?. If you are building a replica (look-alike) it will never be the real thing, and if nobody notices the wheelbase 'inaccuracy' if there even is one, what does it matter? Build your car with the bits you have, to your budget, or whatever criteria you set - as long as you're happy with it and nobody else is harmed, then that's good