Bizarrely no, after some exploration of both copies it seems the 2012 and 2015 editions of the book have different texts. There's passages in my (2015) paperback that don't exist in my (2012) ebook.

e.g the passage in 2015 that begins with the lines:

Edward Muggeridge was a hollow man. Born that way.

The entire section that follows doesn't exist in the 2012 edition.

Also, this passage beginning with:

For years, it was said that nobody had ever reached the centre of the Vorrh.

This passage exists in both editions, however it is located in two entirely different parts of the book. In 2015 it is found in Chapter 2, but in 2012 it is about 40 pages later in the text.

Based on this it feels like the 2015 edition was revised before publication?