In post #9 of your first link Thornbackflound's one has a very similar floor so yep looks like one of their options. But note the boat is a heavier build with far thicker transom, far more substantial grab line arrangement, rowlocks, oar keeepers etc.
Then in your last link (Ebay) the boat has a wooden floor with the similar tube top wear patch and lighter grab lines similar to the one idsebby is looking at on donedeal... it also has the lighter weight transom of the donedeal one.
I wonder if these differences are alternative models such as river/beach type vs a more long range version.
Here's another smaller 3.2m variant with the lighter transon and wooden floor...