That sounds like an inefficient request. At risk of putting words into your customer's mouth, what I think they really need is a single print-out showing the redactions as the gray overlay. I say this based on the assumption that they want to do this side-by-side comparison in order to validate the redaction decisions. If they can see the gray overlay of what is to be redacted but also still see the text underneath, they can verify the redactions without switching from one page to another, losing their place, etc.
Assuming that's the real underlying need, can you give the customer direct access to the Clearwell application so they can review (and even make corrections) online?
Of course, that won't work if your customer is stuck in the paper-mindset. Unfortunately, I don't know of any way to print the Redacted View the way it displays on-screen. Print choices are Native or Production (with all redactions burned in to full-opaque), nothing in between.