I feel the use of Hash might not be required for your task. You have recordID which can act as an index to an array so why put them in a hash and mess up the order? You get linear access in array using index anyways an no overhead of the hash-table
That said, i would do a Matrix(nxn) (square not a requirement, dimensions might change based on num of records of course) to keep track of scores. Consider the following table
The values inside the cell are the scores. Now if you want the best matching score (max value) then a O(n) max will provide you the answer for your records and you have to do that n-times for each record in your first file.
Sorting to finx max/min is an overkill. I might be missing your porblem so please correct me if i am wrong.
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