Find Discrepant IDs Based On Range Of Values In Each ID Row

I have a workbook with three sheets containing patient information from a clinic. Each sheet pertains to a different year. The sheets are formatted such that every row of each sheet contains a patient ID number in column A; in the same row, following the patient ID, is data pertaining to that patient, part of which stays the same (intake data)[=values in columns B:O] and part of which changes (encounter data)[=columns P:AA].

My challenge in cleaning and merging this dataset is that the ID numbers may not be trustworthy: I need a way to validate that there are no patient records [=rows] such that a given row has the same set of identifying information (OpenRecord Date, Sex, Age, History, etc.) located in columns B through O but a different ID number (column A) in a different sheet. In other words, I need to make sure the same patient isn't masquerading by a different ID number across different years [=worksheets]. What I am trying to do is develop a macro or formula that compares each row's range of values for B:O to every other row across each of the three worksheets; then find and list only matches for B:O that do not have the same value in Col A.

Complicating this operation are two considerations: 1) Each sheet in the workbook (excerpt attached) contains about 40,000 rows. 2) DOB is missing; instead, we have "Age." For those patients which appear in all three years captured in the three sheets, the "Age" value (column F) increases by +1 year.

A link to an example file on Google Drive : [URL] ....