Automating an update for all structured tables after adding a header row and renaming the element in the EDD

I use structured tables in my documents for information boxes. Recently, I've changed their structure, adding a header row, renaming the element, and using a different format tag. When I change the element in a document, it does so, but doesn't add a header row automatically (though does in part implement the new format tag) -- is there some way to do a global update of all information boxes (so that they include the newly created header row)?

Also, just to note the new style information boxes (again which are implemented as structured tables) are different elements to the old style information boxes (to solve some naming consistency issues). I was (perhaps naively) hoping that changing the old element names to the new element names would implement the formatting tags associated with the new elements over the old elements (and insert the header row)...