no, no one would have guess that  because a unicorn is a horse with horn that can fly and this is fictional but sushi is a food by japanese in exist in real life  . i cant see the difference tbh but if we are talking about exchanges yes they have many commons
 
if im not mistaken its the sushi ones is the one that is popular or dominating before , before uniswap came out but now sushiswap is hardly being heard but its the uniswap is now the peoples favorite but thanks for the effort of listing their differences , this is helpful for those who are curious and thinks that suhiswap can still be better than uniswal .