There is a mapping from the old map/dungeon levels to the new mapIds, which can be found in a BfA system if you dump the Blizzard code at AddOns/Blizzard_Deprecated/UIMapIDToWorldMapAreaID.lua
If you determine the mapping from the map/dungeon levels to the values used on the sites in a live system, and then use this BfA information, you can then make your mapping from the new BfA mapIDs to the values used on the sites. Not fun, but I bet when you are done if you make it available others may appreciate the work you put into it.
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