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IT Business Analyst should be having a good background about operations procedures.. such background can help them determine if quality standards are met or not.. so yes.. they may apply to quality vacancies
If you avoid the Business Terminology, Any Analyst would internally look into the Quality aspect for any Business that he works for.
The main difference between an IT Business Analyst and Quality Assurance Professional is the real Test cases approach on the particular process or module. If any BA knows this then he can work as a QA. But It's not suggested approach if any BA doesn't aware of QA traditional workflow. But Quality checking is one of the roles for any Analyst of the Business.