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From how I understand quest-logging addons, they can only provide a list of what quests you have completed after the point of installing the addon. As far as I am aware, there is no way for such addons to retroactively find out whether or not X character has completed X quest before the installation of that addon.
So, installing such a addon would be a good idea if this is information you really want to know. Unfortunately, regardless of whether or not you use such an addon, you will have to backtrack and visit the questgivers you are interested in manually.
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