Structuralism is organized around ideology while culturalism is not.

Evidence

It has been remarked that whereas the “culturalist” paradigm can be defined without requiring a conceptual reference to the term “ideology” (the word , of course, does appear: but it is not a key concept), the “structuralist” interventions have been largely articulated around the concept of “ideology”: in keeping with its more impeccably Marxist lineage, “culture” does not figure so prominently. — Hall, Stuart, Essential Essays, Volume 1, 192

Categorization

• DEFINE: A crisp diagnostic distinction: culturalism needs no concept of ideology; structuralism centers it.