I think if you reread the POD you might go a little easier on the module.. "OCR::PerfectCR requires that your input is in perfect shape -- that it hasn't gone into the real world and been scanned, that each image represent one line of text, and nothing else, and most difficultly, that the font have a fairly wide spacing. This makes it very useful for converting image-based subtitle formats to text, and probably not much else. However, it is very good at doing that."

I think theorbtwo's module only recognizes exactly identical images/letters. Your two images are not identical and hence it won't recognize them as identical.