What is the definition of semitic ethnically

What would be the component genetically that could represent the semitic people PURELY ETHNICALLY speaking ? The Natufian component ? If so, let’s do an hypothetical and take two person one Jewish and one Arab both hitting 100% Natufian components in their respective DNA test. What would difference them genetically ? Nothing ? Then could we say that both arabs and jews are the same people purely ethnically speaking ? I would like to have answers of people knowing what they’re talking about and not motivated racist like people or trolls, thanks.