I think is a questionable technique, you could change completely the meaning of the text without notice unless you add some people to the equation and check line by line (and even in this case checking should be much more easier before with the original OCR!).

If this is not possible in any case, maybe you could improve the method if you repeat the OCR several times and do the match several times in different copies of the same page

and/or

extract a dictionary with all the words used in your files, count the words, sort the similar words by probability of appearing in the file and thus do the replace taking in mind this. Forget the idea of a complete dictionary with a lot or very rare words. Is much more error prone.