I don't understand your question. .prc is not the same as .tpz, they are completely different formats. .prc is basically a slightly simplified .mobi. Usually if you just change the file extension to .mobi, it still works fine. .tpz is Topaz format, which is like images of the characters in a book. I have never had any luck with converting Topaz books.
If you still have an Amazon account, you can install Kindle for PC, and re-download the book to that.
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