I wouldn't see it that way. Satoshi has created a truly new "product" (of course there was some preliminary work, but Satoshi has assembled many individual elements into something new that did not exist before and solved an essential problem), while Vitalik has improved this product with some new features.

It's kind of like saying Satoshi invented the car and Vitalik added electronic power steering and a navigation system. One would say the invention of the car itself was a much greater invention. And that's how I see it with Bitcoin and Ethereum. Nevertheless, Vitalik has made a huge contribution to entire crypto domain.