The difference is academic unfortunately. If you have no interior then you won’t win, but if your interior is cack, basic or unimaginitive enough you’ll also fail to win. But if you want your car’s engineering to be judged, regardless of your overall result, then it might be worth entering but you’d be at the mercy of the OP; you may get a blurb or two but most hosts only give, at best, a sentence before applying the instabin.
So, my 2c (and my strategy), I’d just sit out this round and wait for one that’s less fixture based if I were you.
Also, maybe you could whip up something for Cult of Personality II; no interior required, your car will be given a decent write-up and you can explore lore building without the hassle of intense competition!