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Personally, I'd be cautious against creating too many theological tags, as this is a Hermeneutics Stack Exchange, rather than Theology, and though the two are intertwined, the focus of this site should always be the text itself and the authorial intent. This may cause confusion for new users coming onto the site as they grow to understand the scope and focus ...
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On examination, nobody had ever created guidance for either tag, so I understand the confusion here. Often we have near-duplicate tags which are created like this, which just need cleaned up when we find them.
Honestly I can't really see any difference between them, so I've merged them both into 'Chronology', and added a new Synonym so that if anybody tries ...
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