Question on Category Theory

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My question is if this phrase ("structural isomorphisms between groups of mathematical areas") is supposed to mean an isomorphism of categories, or the category Grp, or
any 1 category or a group isomorphism?

Thanks


"Relations among abstract structures of mathematical operations (e.g., detecting structural isomorphisms between groups of mathematical areas "

this is from a developmental psychology textbook under
Table 6.1 Developmental Transformations of Hierarchical Complexity in Three Domains
the column on the left hand side is the one for Math.