You are right, I did not notice that they were different publishers. However, I would just like to point out that the prices you are seeing are still not the one I am seeing.
One of the commenters on my blog (and one on Reddit) mentioned that they were $0.50 apart now, and that is not the case for myself, as I still see a $3.13 difference in prices!
The Tor Books version is far and away better on the eyes due to the font, but from what I can tell, they are the exact same book.
Either way, I can adjust it (and I'm kinda dumb to not have noticed it before) so there goes the differentiation I guess?
Just two different publishers with the same book. A tad frustrating, but oh well.