It seems like an IF/Vlookup string is needed... this may not be exact... but hopefully close enough for you to tailor to your specifications.
This may just work for you... copy into column Q on Sheet 1 then take the formula and drag down to last cell with data in it. If the response comes back as "OOPS" then the row of information pertaining to that cell is not on Sheet 2... if the data is on BOTH sheets then it should come back as the USER ID
If you need to transport the data from one sheet to another for USER IDs that are on both sheets but not the other info... use a simple VLOOKUP formula to handle it for you.
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