What is the extra product resulting from the $\beta$ oxidation of a saturated fatty acid with 19 carbons as compared to that of a fatty acid with 18 carbons?

Question

What is the extra product resulting from the

\beta

oxidation of a saturated fatty acid with 19 carbons as compared to that of a fatty acid with 18 carbons?

What is the extra product resulting from the β\betaβ oxidation of a saturated fatty acid with 19 carbons as compared to that of a fatty acid with 18 carbons?