What does difference in ranges of eigenvalues convey?

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If there are two matrices A and B.

The eigenvalues of A are in range 0-80 and eigenvalues of B are in range 0-0.09.

What can we say about A and B ? Does it make sense to compare A and B based on the difference in ranges ?

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Let T - operator given by matrix.

In finite dimensional case, the set of eigenvalues is equal the set of scalars P such that operator (T-P*Id) is not reversible. The supremum of set of norms of eigenvalues (in euclidean norm) is called spectral ray of the operator.

So, for example operator B-20*Id is reversible because spectral ray of B is 0.09. However, we don't know if A-20*Id is reversible unless we count eigenvalues.