Issues with SOA

Ok i have the Disc for my Xbox 360 for Adoulin But i cant find my Book with the Code on it anywhere "no idea wth happend to it " Anyways i cant get another copy in the EU for the xbox because there are none lol.
I was Wondering if i could Buy a Pc version and Use Said code on my xbox
i thought it would be better to ask before i jumped rite in there and messed it up lol.

I have done this in the past. Registration codes can jump systems.

Registration codes are cross compatible since you're basically just unlocking privileges on the character itself, the 360 disc though which you already have will be required for 360 play so you should be set.