Created jpegs but now they want TIFFs, how can I avoid a re-shoot?

Hi All.
I shot loads of images as jpegs as requested. Now the customers says actually I'll need them in TIFF!! As the shoot went on I exported the images to 34 folders with 56 subfolders containing 751 jpeg images. I now need to supply exactly the same but with TIFFs. Now I still have the raw files in my C: and it would be lovely to simply re-import them and export them as TIFFs but without looking at every single raw file and finding where ever the corrosponing jpeg is I have no way of exporting the new TIFFs to sit alongside their jpeg counterparts, if you see what I mean? Is there anyway I can utilise/batch process the raw files and export them to right folders as TIFFs?
Many thanks

Right after I posted I realized I probably had that wrong, but couldn't take it back .
Anyway, if the jpeg filenames were derived from metadata in the raw files (even if not keywords), this will be fairly straight-forward. If jpeg filenames were typed in one-at-a-time, then not so straight-forward.
So, assuming the jpegs were renamed, how were those names generated? by hand??, or by machine???......
Summary:
========
The objective is clear: we need to "reverse map" the jpegs to the raws... however, in order to know how to reverse map, it would help to know how they were mapped in the first place.
Yes, you may be able to find a 3rd party app to actually do image comparison, but we're trying to see about doing it in Lightroom first, or at least I am...
R

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