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My guess is that any products in the CM are available as replacements. The Blight was not a Paizo product, so why would they limit replacements to Paizo products?
If the product you want is Paizo, you have to already have the PDF.
Good question about multiple smaller products, though! I wish I'd asked that before making my selection - I would have grabbed two of the Bestiaries rather than RotRL, I think.
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