For many products there is a way to separate out the reviews, although it is not obvious how to do it:
Click the "nnn customer ratings" to get to the review section.
In the barchart on the left, click any of the "n star" or "nn%" links.
Above the reviews will be a row of dropdown lists, which may include "All formats" or "All styles" or the like. There you can select the individual product variation. You can also change the "n star only" to "All stars" to get all the reviews for that variation.
Unfortunately this doesn't work for the book being discussed here.
I just checked a dozen books, from the ones Amazon recommends for me, from their best sellers, and in some randomly chosen categories, and didn't run across any that allowed format filtering.
Also, I distinctly recall I used to see reviews where between the reviewers name and their review, Amazon added a note saying what format the review was for. I'm not seeing that anymore, either.
Interesting, I do still see the filter choices for other products, and I thought I used to see them for books.
Maybe they stopped doing it for books? (Other filters are still there, but not filtering by edition.)