You've described the concept of what you want to do so I can describe the concept of a solution.
You can write VBA code in a single Excel file to do this. What is your level of knowledge about VBA?
The code has to have some way of identifying which files to work on. The easiest way is to put them all in the same folder, and nothing else in that folder. You can use this code to iterate through them:
How many is "many" and how similar is "similar"? You haven't provided any information about data layout or how to do this mapping of keys and values, so I can't offer anything else.
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