Blue Prism is not an OCR product, it is an application interface product. I would also strongly argue that Tesseract/Abbyy are not fit for purpose for many mult-format use cases where 100% accuracy are required (so don't be fooled by some other RPA tools that say they can do OCR - that is usually irrelivant if it is not accurate and does not provide strucured data from multiple sources)
Blue Prism is currently looking into ICR solutions (machine learning and visual verification included) and will hopefully have something to announce in the near future. In the interim it is worth having the discussion with your Blue Prism Account/Partner manager as other clients have used ICR tools successfully to feed their Blue Prism solutions.