Hmmm....? Me thinks you have a problem on your hands!!
I can't see that there can be a one formula fits all solution for this one.
Try variations of this
Based on your one worked example this returns a result for 172 out of your 791 items and I cannot vouch for there not being duplicates/errors in the result.
If #VALUE! is returned then the formula has failed, if it returns #N/A when used with this lookup formula
Then it might be an error in converting mm to thous (1/25.4)
or there might not be a match, or the formula doesn't apply to that item, I have no way of knowing which.
Trim() might help in some cases.
You could copy out the rows with potential solutions, then build a similar formula to sift the remaining items, and repeat until it is easy to manaully fix the remainder.
Hope this is of some little help.
P.S. will post example soon, there seems to be a problem attaching the file at the moment.
P.P.S had to zip the file although the file is only 785kb....
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