[johnbuckley]

Originally jets were numbered replacements generally aren't. Flow testing is the only way to ensure accuracy of jets; various articles elsewhere on Fordbarn about that topic!
If going by numbering Idle usually 10 or 11, Main19.5 or 20, Comp 18 or 19, Cap 19, 20, or21 jets are interchangeable on SV and DVs and Zeniths I and 2 and Holleys lookalikes ,