Edit: In bookmark-dupes-5.5, there will be a special replacement text $TITLE which can be used to find “dupes” with the same title. The github page contains already more detailed instructions and a test version.

With bookmark-dupes-5.4, if you are looking for dupes with a _particular_ title (and not for duplicate titles in general), you can create a “modify” rule which checks for this title and replaces the whole URL by a fixed string. You need to fill the following fields for this rule:

“Name matches”: “\0NAME$” (without quotes; NAME is the name you are looking for; write \ in front of every non-letter).
“Replace URL matches”: “.+” (without quotes; this matches the whole URL)
“By” “x” (here, x can be any nonempty dummy text; in bookmark-dupes-5.5, x can even be empty (which was currently not supported due to misguided “safety” considerations)).

Instead of “Name matches” you can also use an URL match for the part which all bookmarks you want to "match" have in common. Or you can simply replace in your example the page number by an empty string, leaving the (common) rest of the URL as it is.

The latter is IMHO the solution which should be preferred, because it is is least likely to give wrong positives, but you need a rule especially adapted for your URL.