Note: there’s a limited version of this feature already available. If you select an existing piece of text and then leave it selected while you use the Text tool to create new text, its style will match the piece of text you had selected.
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There is a plugin called "Selection" - allows you to choose one object on your art board or global art boards that will change everything "like" that object based on a list of criteria. I.E. font size, shape, color, etc..