Translation of "difference" into Basque

Some two days later, after spending the morning going back and forth with a story, I sat down to read the two texts again after lunch, trying to see what the difference was from the original to the one I had translated. I couldn't.

Handik bi egunera-edo, goiza ipuin batekin atzera-aurrera ibili ondoren, bazkalondoan bi testuak irakurtzen jarri nintzen beste behin, jatorrizkotik nik itzulitakora zer alde zegoen ikusi nahian. Ezin nuen.