edin80, I have the WE9 version instead of the PES5 because I lived in the United States for a year. Therefore I got my Xbox in the NTSC format. So now I only use the Xbox to play WE9 because you can patch the option files and also I could continue with the Master League Saves I had.
Then I got the Xbox 360 in PAL format, for Europe, therefore I can not play the WE9 in the 360. And since you can not patch the option file in the 360 system, I continue playing WE9 in the old Xbox I brought from America.
Now if you have the PES5 (version for Xbox), you can play it also in the 360.
There is not an Xbox 360 version for PES5 nor WE9. But again you can play these games in the Xbox. If you do have the European version then you will be playing with the PES5.
There are rumors that say the next edition of Pro Evolution Soccer - Winning Eleven will be developed for the so called next gen consoles (Xbox360 and PS3). When? I guess it will take a while.
Hope I could help.