I have read the Red Rising trilogy as paperbacks published by Del Rey, a US publisher. (I bought these books while in the US.)
Now being based in Europe, I want to starting buying the follow-up trilogy, and noticed there are two versions of each book, one by Del Rey (Iron Gold and Dark Age) and one by Hodder & Stoughton (a British publisher: Iron Gold and Dark Age).
Are these different? Is maybe one US English spelling and one British English spelling? (Note that the author is an American.) If not, why are two publishers to begin with?
Some motivation for my question (beyond general interest) is that I would not like switching from US English to British English during one story line; also, I like to read authors' works as originally as possible, usually. However, the British books are a bit cheaper in Germany. So, would I be able to buy the British publisher's version and still continue reading US English?