  We calculate the differences between reaction and interaction cross sections
in the collisions of relativistic light ions with $\text{A}<40$ in the
framework of Glauber theory. Although, in the optical approximation of Glauber
theory these differences are approximately 1% of the reaction cross sections or
less, they increase up to 3-4% when all scattering diagrams of Glauber theory
are included in calculation.
