The Examination Manual treats the words like they are synonyms as well.
Page 11:As part of the scoping and planning process, examiners should obtain and evaluate the supporting documents of the independent testing (audit) of the bank’s BSA/AML compliance program.
Page 23: Independent testing (audit) should review the bank’s risk assessment for reasonableness.
Page 30: Independent testing (audit) should be conducted by the internal audit department, outside auditors, consultants, or other qualified independent parties.
There are many other examples there, but I would expect a CPA firm to shy away from calling it an "audit" in favor of a more ambiguous term, the one actually used in the regulation.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.