I have been a director of a company which has charity status some years ago. I needed to understand the role of both director and trustee and tge responsibilities and liabilities of both as a charity trustee and also as a director. There were implications in both company law and charity law.
I was responsible (with others) for decision making so needed to be fully involved becsuse as a trustee I was personally liable if stupid decisions were taken.
I'd be certain what they are looking for and want to see them properly in action before I agreed to do either job.
I'm not sure that directors are personally liable though.