Select the book in Calibre. Tap the t key to open it in the editor. In the editor in the left column double click on the file for the first chapter where you want it to start; it will fix all following chapters as well. In the big pane where the chapter contents is find the first quote and drag over it to select it (and only it). Then do control F and that will bring up the search and replace box below. The quote you selected will be filled in in the Find: box. In the Replace: box type in the replacement quote. In the mode line below change the drop down to All text files; the third drop down should be Down. Click on the Replace All button. Repeat for the other quote.
Keep your fingers crossed and hope it doesn't screw anything up in the html header at the top; the stuff with angle brackets.
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